promql: reject NaN/Inf and fix overflow bound in duration expressions by alexmchughdev · Pull Request #18639 · prometheus/prometheus

alexmchughdev · 2026-05-07T16:29:35Z

Summary

calculateDuration in promql/durations.go converts a float64 seconds value into a time.Duration (int64 nanoseconds) via time.Duration(duration*1000) * time.Millisecond. Two related issues let invalid input slip through:

Overflow bound is in the wrong unit. The check was
```
if duration > 1<<63-1 || duration < -1<<63 {
```
That compares a value in seconds against the nanosecond range of int64. The actual safe input range is +/- math.MaxInt64 / 1e9 seconds (about 292 years), roughly 1e9 times tighter. Arithmetic on legal duration literals via DurationExpr (e.g. MUL / POW operators) could produce a finite seconds value that passed the check but overflowed during the final time.Duration conversion, yielding an implementation-defined int64 silently flowing into selector Range, OriginalOffset, and Step. The parser already uses the correct bound for duration literals in offset_duration_expr (1<<63 / 1e9); this PR aligns calculateDuration with it.
NaN bypasses every check. NaN compares false against everything, so a NaN duration produced by e.g. math.Pow(-1, 0.5) (and similar via MOD) bypassed both the negative-value check and the magnitude check, again producing an implementation-defined int64 in the conversion. +/-Inf on the negative side has the same problem.

Fix

Reject NaN and +/-Inf up front, and align the magnitude bound with offset_duration_expr in generated_parser.y (1<<63 / 1e9).

if math.IsNaN(duration) || math.IsInf(duration, 0) {
    return 0, fmt.Errorf("...: duration is NaN or infinite")
}
...
if duration > 1<<63/1e9 || duration < -(1<<63)/1e9 {
    return 0, fmt.Errorf("...: duration is out of range")
}

Tests

Added regression cases in promql/durations_test.go covering:

NaN from (-1) ^ 0.5 (with allowedNegative: true so this case isn't trapped earlier).
+Inf from 2 ^ 1e10.
1e10 seconds rejected as out of range.
1e9 seconds (just under the new bound) accepted with the exact expected time.Duration value.

All four would have failed against the previous code (silently producing a bogus time.Duration value or accepting a value that overflows the conversion).

Test plan

go test ./promql/ -run "TestCalculateDuration|TestDurationVisitor" (4 new sub-tests, all 16 originals pass)
go test ./promql/ -short
go vet ./promql/

[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration.

calculateDuration converts a float64 seconds value into a time.Duration nanoseconds value via "time.Duration(duration*1000) * time.Millisecond". Two related issues let invalid input slip through: 1. The bounds check used "duration > 1<<63-1 || duration < -1<<63", comparing a value-in-seconds against the int64 nanosecond range. The safe input range is +/- math.MaxInt64 / 1e9 seconds (about 292 years), roughly 1e9 times tighter. Arithmetic on legal duration literals (e.g. constructed via MUL/POW operators in DurationExpr) could produce a finite value that passed the check but overflowed during the final time.Duration conversion, yielding an implementation-defined int64 silently flowing into selector Range, OriginalOffset, and Step. 2. NaN compares false against everything, so a NaN duration produced by math.Pow(-1, 0.5) (and similar) bypassed both the negative-value check and the magnitude check, again producing an implementation-defined int64 in the conversion. Reject NaN and +/-Inf up front, and align the magnitude bound with the parser's offset_duration_expr rule (1<<63 / 1e9), which already had the correct unit. Add regression tests covering each new failure mode and a happy-path case just below the new bound. ```release-notes [BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. ``` Signed-off-by: alexmchughdev <alexanderedwardmchugh@gmail.com>

Signed-off-by: alexmchughdev <alexanderedwardmchugh@gmail.com>

alexmchughdev · 2026-05-07T17:41:55Z

The Windows failure is in TestQuerierShouldNotFailIfOOOCompactionOccursAfterRetrievingIterators_AppendV2 (tsdb/db_append_v2_test.go), a pre-existing flake unrelated to this PR. Same test failed on main at da1f89e (run 25453798327, job 74677738690). My change is in promql/durations.go and the durations test only. Nothing in either touches files, paths, time.Now, or any Windows-sensitive primitive. Local go test ./promql/... passes clean. Could you re-run Go tests on Windows?

…➔ v3.12.0) (#730) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [quay.io/prometheus/prometheus](https://github.com/prometheus/prometheus) | minor | `v3.11.3` → `v3.12.0` | --- ### Release Notes <details> <summary>prometheus/prometheus (quay.io/prometheus/prometheus)</summary> ### [`v3.12.0`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0): 3.12.0 / 2026-05-28 [Compare Source](prometheus/prometheus@v3.11.3...v3.12.0) - \[SECURITY] Remote-write: Reject snappy-compressed requests whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate(), and `increase()`calculations, behind a feature flag`use-start-timestamps`. Doesn't work together with extended range selectors `anchored`and`smoothed\`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.erwanleboucher.dev/eleboucher/homelab/pulls/730

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

@hibrian827

##### [\`v3.12.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.12.0) This release contains security fixes, new features (especially around PromQL and Service Discovery), performance improvements in TSDB, Start Timestamp improvements and numerous bug fixes. Thanks to all contributors! #### Key Highlights - **Security**: Two security vulnerabilities have been addressed: a denial of service in remote-write (snappy decompression limit) and a secret exposure leak in STACKIT service discovery. - **PromQL & Metadata**: Several features and bug fixes related to the experimental "start timestamps" support, including updates to `rate()`, `irate()`, `increase()`, and `resets()`. New experimental functions `start()`, `end()`, `range()`, and `step()` are introduced. - **TSDB Performance**: Optimizations in head chunk lookup (constant time) and mmap operations to reduce CPU usage. - **Service Discovery**: Added support for DigitalOcean Managed Databases and Outscale VM, along with improvements to AWS SD (IPv6 support for EC2, external ID support). - **UI**: Added a web interface for deleting time series and cleaning tombstones. #### Changelog - \[SECURITY] Remote: Reject snappy-compressed received requests via Remote Write whose declared decoded length exceeds the 32MB. Thanks to [@hibrian827](https://github.com/hibrian827) for reporting it. [#18642](prometheus/prometheus#18642) - \[SECURITY] STACKIT SD: Fix secrets being exposed in plaintext via `/-/config` endpoint. Thanks to [@August829](https://github.com/August829) and [@Phaxma](https://github.com/Phaxma) for reporting. GHSA-39j6-789q-qxvh [#18649](prometheus/prometheus#18649) - \[CHANGE] TSDB/Agent: Adds Start Timestamp field to all WAL Histogram samples in memory; used `st-storage` flag is enabled. [#18221](prometheus/prometheus#18221) - \[FEATURE] API: Add `/api/v1/status/self_metrics` endpoint returning the current state of the Prometheus server's own metrics about itself as JSON. [#18411](prometheus/prometheus#18411) - \[FEATURE] Discovery: Add DigitalOcean Managed Databases service discovery [#18287](prometheus/prometheus#18287) - \[FEATURE] Prometheus: Add support for the aix/ppc64 compilation target [#18321](prometheus/prometheus#18321) - \[FEATURE] Discovery: Add Outscale VM service discovery (`outscale_sd_configs`) for discovering scrape targets from the Outscale Cloud API. [#18139](prometheus/prometheus#18139) - \[FEATURE] PromQL: Emit a warning when `sort`, `sort_by_label` or `sort_by_label_desc` is used within range (matrix) queries, as these functions do not have effect in that context. [#18498](prometheus/prometheus#18498) - \[FEATURE] PromQL: Add `start()`, `end()`, `range()`, and `step()` experimental functions [#17877](prometheus/prometheus#17877) - \[FEATURE] PromQL: Update `resets()` function to consider start timestamp resets. Hidden behind `use-start-timestamps` feature flag. [#18627](prometheus/prometheus#18627) - \[FEATURE] Prometheus: Promote auto-reload-config as stable [#18620](prometheus/prometheus#18620) - \[FEATURE] TSDB/Agent: Add `CheckpointFromInMemorySeries` option to `agent.DB` that enables checkpoint based on in-memory series. [#17948](prometheus/prometheus#17948) - \[FEATURE] UI: Add a web interface for deleting time series and cleaning tombstones, accessible from the Status menu. [#18390](prometheus/prometheus#18390) - \[FEATURE] PromQL: Use start timestamps for `rate()`, `irate()`, and `increase()` calculations, behind a feature flag `use-start-timestamps`. Doesn't work together with extended range selectors `anchored` and `smoothed`. [#18344](prometheus/prometheus#18344) - \[FEATURE] Scrape: Added a feature flag `st-synthesis` which synthesizes unknown STs for scraped cumulative metrics. Useful when Remote Writing 2.0 with delta or Otel-based backends. [#18279](prometheus/prometheus#18279) - \[FEATURE] promqltest: support `@st` annotation in `load` blocks to specify per-sample start timestamps. [#18360](prometheus/prometheus#18360) - \[ENHANCEMENT] API: reject concurrent fgprof profiles. [#18651](prometheus/prometheus#18651) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field to ECS/MSK/RDS/Elasticache. [#18579](prometheus/prometheus#18579) - \[ENHANCEMENT] AWS SD: Add optional `external_id` field. [#17171](prometheus/prometheus#17171) - \[ENHANCEMENT] Discovery: Propagate SD target updates faster by introducing dynamic backoff interval instead of static 5s interval for throttling. [#18187](prometheus/prometheus#18187) - \[ENHANCEMENT] Promtool: Add `--header` flag to `query instant` command, matching existing `query range` behaviour. [#18418](prometheus/prometheus#18418) - \[ENHANCEMENT]: AWS SD: Allows EC2 service discovery to discover IPv6 addresses to communicate with target endpoints. The private IPv4 address remains the default when both IPv4 and IPv6 addresses are present. [#16088](prometheus/prometheus#16088) - \[PERF] TSDB: Make head chunk lookup in range queries constant time instead of quadratic time [#18302](prometheus/prometheus#18302) - \[PERF] TSDB: Skip entire stripes in mmapHeadChunks when no series need mmapping, reducing CPU utilization significantly at production-relevant scales. [#18541](prometheus/prometheus#18541) - \[PERF] TSDB: Skip clean series during periodic head chunk mmap using cached head chunk count [#18272](prometheus/prometheus#18272) - \[PERF] PromQL: Address FloatHistogram.KahanAdd performance regression on Go 1.26. [#18568](prometheus/prometheus#18568) - \[BUGFIX] PromQL: Fix `info()` function incorrectly handling negated `__name__` matchers [#17932](prometheus/prometheus#17932) - \[BUGFIX] API: Return duration expressions in `/parse_ast`. [#18624](prometheus/prometheus#18624) - \[BUGFIX] API: correctly document formats accepted for duration query request parameters (step, timeout and lookback delta) in OpenAPI spec [#18305](prometheus/prometheus#18305) - \[BUGFIX] Scrape: AppenderV2 now tracks staleness even when OOO/duplicate series errors happen similar to AppenderV1 [#18567](prometheus/prometheus#18567) - \[BUGFIX] Config: Validate remote\_write queue\_config fields at load time to prevent runtime panic and silent misconfiguration. [#18209](prometheus/prometheus#18209) - \[BUGFIX] Discovery/Consul: Add `health_filter` for Health API filtering, fixing breakage when using Catalog-only fields like `ServiceTags` in `filter`. [#18479](prometheus/prometheus#18479) [#18499](prometheus/prometheus#18499) - \[BUGFIX] OTLP: limit decompressed body size for gzip-encoded OTLP write requests. [#18408](prometheus/prometheus#18408) - \[BUGFIX] PromQL: Fix `smoothed` rate/increase returning zero instead of no result when all data falls strictly after the query range. [#18523](prometheus/prometheus#18523) - \[BUGFIX] PromQL: Fix metric name not being dropped when last\_over\_time or first\_over\_time is applied to subqueries containing name-dropping functions like abs(). [#18409](prometheus/prometheus#18409) - \[BUGFIX] PromQL: Fix missing warning when mixing exponential and custom-bucket histograms in stats queries. [#18660](prometheus/prometheus#18660) - \[BUGFIX] PromQL: Fix parsing of `range()` keyword in duration expressions such as `foo[5m+range()]`. [#18623](prometheus/prometheus#18623) - \[BUGFIX] PromQL: Fix smoothed vector selector returning no results in binary operations when the `@` modifier is used. [#18531](prometheus/prometheus#18531) - \[BUGFIX] PromQL: Reject NaN, infinite, and out-of-range duration expressions instead of silently producing an out-of-range time.Duration. [#18639](prometheus/prometheus#18639) - \[BUGFIX] Scrape: Fix panic when scraping malformed native histograms. [#18414](prometheus/prometheus#18414) - \[BUGFIX] Scrape: fix panic when scraping a target exposing a summary with no quantiles via the protobuf format. [#18382](prometheus/prometheus#18382) - \[BUGFIX] Scrape: fix scrape failure log file occasionally not applied after a configuration reload. [#18421](prometheus/prometheus#18421) - \[BUGFIX] TSDB: Allow retention percentage with new data path. [#18628](prometheus/prometheus#18628) - \[BUGFIX] TSDB: Preserve decimal precision in percentage-based retention [#18374](prometheus/prometheus#18374) - \[BUGFIX] TSDB: fix prometheus\_tsdb\_head\_chunks going negative after WAL replay [#18401](prometheus/prometheus#18401) - \[BUGFIX] TSDB: panic with native histograms during query of overlapping chunks. [#18692](prometheus/prometheus#18692) - \[BUGFIX] Tracing: fix startup failure for insecure OTLP HTTP tracing [#18469](prometheus/prometheus#18469) - \[BUGFIX] UI: Escape label values offered by PromQL autocomplete. [#18658](prometheus/prometheus#18658) - \[BUGFIX] UI: Improve Y-axis tick label precision for graph values over small ranges. [#18682](prometheus/prometheus#18682) - \[BUGFIX] `prometheus_sd_refresh*` and `prometheus_sd_discovered_targets` metrics for specific scrape jobs are deleted when the scrape job is removed. [#17614](prometheus/prometheus#17614) - \[BUGFIX] Remote: fixed validation for received RW2 requests when parsing metadata unit symbols. This fixes a case when request would cause (recovered) handler panic. [#18641](prometheus/prometheus#18641) - \[BUGFIX] TSDB/Agent: fix race in agent appender where concurrent appends for the same label set could produce duplicate in-memory series and duplicate WAL records. [#18292](prometheus/prometheus#18292) - \[BUGFIX] Config: Update `--enable-feature` flag description and sort feature names. [#18487](prometheus/prometheus#18487)

alexmchughdev requested review from a team and roidelapluie as code owners May 7, 2026 16:29

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Signed-off-by: alexmchughdev <alexanderedwardmchugh@gmail.com>

roidelapluie approved these changes May 8, 2026

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roidelapluie enabled auto-merge May 8, 2026 12:09

roidelapluie merged commit 6299449 into prometheus:main May 8, 2026
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promql: reject NaN/Inf and fix overflow bound in duration expressions#18639

promql: reject NaN/Inf and fix overflow bound in duration expressions#18639
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alexmchughdev commented May 7, 2026

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