scrape: support zstd-compressed responses by fancive · Pull Request #19502 · prometheus/prometheus

fancive · 2026-08-22T07:51:04Z

This adds zstd as a supported scrape response content encoding while preserving the existing identity and gzip paths. It reuses single-concurrency zstd decoders through a pool and keeps the body-size limit applied to decompressed bytes.

The tests cover compression negotiation, identity/gzip/zstd responses, decompressed body-size limits, malformed compressed responses, and decoder pool reuse/reset behavior.

Which issue(s) does the PR fix:

Fixes #13866

Release notes for end users (ALL commits must be considered).

Reviewers should verify clarity and quality.

[ENHANCEMENT] Scraping: Support zstd-compressed scrape responses, enabled via feature flag `zstd-scrape`.

krajorama

I think this needs a feature flag for a couple of releases on principal. Otherwise it's a sudden change in how the server behaves.

krajorama · 2026-08-26T07:58:36Z

Also it would be nice to have a debug log when zstd is used, at least for a while while people test this out.

fancive · 2026-08-27T01:49:29Z

Thanks, addressed. Zstd scrape compression is now gated behind --enable-feature=zstd-scrape, and a debug log is emitted whenever a zstd-compressed scrape response is used.

krajorama

LGTM, please rebase, also I have a comment on the documentation.

krajorama · 2026-08-27T08:45:16Z

@fancive are you going to test this in production?

Signed-off-by: fancivez <[email protected]>

Signed-off-by: fancivez <[email protected]> Change-Id: Ic2b3c9a8bc92d2fba402da97fcb3e845602b0ff5

fancive · 2026-08-28T04:17:40Z

I do not have a production Prometheus deployment available to test this directly. I did run a local process-level end-to-end test against the rebased head (ebc287edc70df52905662cce4128fb298b1513cf):

Built and started Prometheus from this branch plus a real HTTP scrape target that selects zstd or gzip from Accept-Encoding.
Without the feature flag, the target observed Accept-Encoding: gzip; the scrape target was up and the sample was queryable.
With --enable-feature=zstd-scrape, the target observed Accept-Encoding: zstd,gzip and returned a zstd-compressed response. Prometheus kept the target up, ingested the sample (zstd_e2e_value = 42), and emitted the expected Using zstd-compressed scrape response debug log.
The related ./scrape and ./cmd/prometheus tests also pass.

So the negotiation, decoding, ingestion, query, fallback behavior, and debug logging have been exercised locally end to end, but not in production.

fancive · 2026-08-28T04:24:25Z

The failing Go tests check did not reach the test step. The runner timed out three times while pulling quay.io/prometheus/golang-builder:1.27-base (Client.Timeout exceeded while awaiting headers / context deadline exceeded). The other test, lint, build, fuzzing, compliance, and DCO checks passed.

I do not have permission to rerun the upstream workflow. Could a maintainer please rerun the failed job?

krajorama

lgtm

reneleonhardt · 2026-08-28T13:16:18Z

Thank you so much, a 2 years old proposal finally completed, fast zstd compression! 🚀

##### [\`v3.15.0\`](https://github.com/prometheus/prometheus/releases/tag/v3.15.0) - \[CHANGE] PromQL: A range query whose `end` was not aligned to `step` caused subqueries inside it to evaluate past the parent's last actual step, inflating `peakSamples` in the query stats and against the `query.max-samples` limit, and wasting storage I/O reading samples that were never used in the result. Add tests to prevent regression of the fix made in [#18081](prometheus/prometheus#18081). [#18598](prometheus/prometheus#18598) - \[CHANGE] PromQL: Do not register a start timestamp reset if the start timestamp hasn't changed between subsequent samples. [#19454](prometheus/prometheus#19454) - \[CHANGE] Logging: Deprecate `--log.level`; use `runtime.log_level` configuration to supply the default level. [#19511](prometheus/prometheus#19511) - \[FEATURE] Configuration: Allow changing the process log level through `runtime.log_level` on configuration reload. [#19511](prometheus/prometheus#19511) - \[FEATURE] Prometheus: Add `--auto-gomemlimit.refresh-interval` flag to periodically re-detect the container or system memory limit and update `GOMEMLIMIT` at runtime. [#18843](prometheus/prometheus#18843) - \[FEATURE] Scraping: Add support for scraping targets via Unix Domain Sockets. [#12024](prometheus/prometheus#12024). [#18091](prometheus/prometheus#18091) - \[FEATURE] scrape: Implement OM2.0 scrape format. [#18606](prometheus/prometheus#18606) - \[ENHANCEMENT] Reduce TSDB head CPU utilization when initializing. [#18001](prometheus/prometheus#18001) - \[ENHANCEMENT] Docker SD: Add labels `__meta_docker_container_image` and `__meta_docker_container_image_id`. [#19386](prometheus/prometheus#19386) - \[ENHANCEMENT] Mixin: Add a p95/p99 remote-write send-batch latency panel to the remote-write dashboard. [#19500](prometheus/prometheus#19500) - \[ENHANCEMENT] Mixin: Support native histograms in the remote-write send-batch latency panel. [#19522](prometheus/prometheus#19522) - \[ENHANCEMENT] PromQL/TSDB: The `--enable-feature=st-storage` flag now automatically enables XOR2 float chunk encoding and ST-capable histogram chunk encoding, so you no longer need to pass `xor2-encoding` and `histograms-st-encoding` alongside it. [#19518](prometheus/prometheus#19518) - \[ENHANCEMENT] Remote write / Alertmanager: upgrade sigv4 to v0.5.0, adding `session_name` and `tags` fields for STS AssumeRole sessions. The previously undocumented `service_name` field is now also documented. [#19569](prometheus/prometheus#19569) - \[ENHANCEMENT] Scraping: Support zstd-compressed scrape responses, enabled via feature flag `zstd-scrape`. [#19502](prometheus/prometheus#19502) - \[ENHANCEMENT] TSDB: Stabilize the XOR2 float chunk encoding. `--enable-feature=xor2-encoding` is deprecated; use `storage.tsdb.chunk_encoding.floats: xor2` instead. Check that other software reading the TSDB directly (e.g. Thanos sidecar) supports XOR2 before enabling. [#19461](prometheus/prometheus#19461) - \[ENHANCEMENT] TSDB: add `prometheus_tsdb_head_appenders_created_total` metric. [#19411](prometheus/prometheus#19411) - \[ENHANCEMENT] Tracing: add more spans to scrapes, API queries and rule evaluations. [#19410](prometheus/prometheus#19410) - \[ENHANCEMENT] UI: Show the effective configuration for each scrape pool on the Targets and Service Discovery pages. [#19384](prometheus/prometheus#19384) - \[ENHANCEMENT] scrape: Enable start time synthesis for summary `_count` and `_sum` series in scrape appender v2. [#19323](prometheus/prometheus#19323) - \[ENHANCEMENT] scrape: stop all pools in parallel for faster shutdowns. [#19295](prometheus/prometheus#19295) - \[ENHANCEMENT] storage/remote: Add undocumented failed\_request\_logging config field to debug log remote write V2 requests on send errors. [#19249](prometheus/prometheus#19249) - \[ENHANCEMENT] TSDB: Add fast path for XOR chunk decompression to speed up queries. [#18049](prometheus/prometheus#18049) - \[ENHANCEMENT] UI: Improve native histogram table formatting and add a background bar indicating the bucket count. [#19332](prometheus/prometheus#19332) - \[ENHANCEMENT] TSDB: Add `prometheus_tsdb_head_series_pending_commit_underflow_total` to report pending-sample reservation underflows. [#19470](prometheus/prometheus#19470) - \[PERF] AWS SD: Build RDS cluster labels once per cluster instead of once per instance. [#19504](prometheus/prometheus#19504) - \[PERF] AWS SD: Describe RDS instances of different clusters concurrently, bounded by `request_concurrency`. [#19506](prometheus/prometheus#19506) - \[PERF] AWS SD: Describe each ElastiCache resource once per refresh instead of twice. [#19585](prometheus/prometheus#19585) - \[PERF] Remote read: Avoid cloning labels for sampled reads when no external labels are configured. [#19503](prometheus/prometheus#19503) - \[PERF] Remote write: Reuse OTLP converter scratch state between requests. [#19388](prometheus/prometheus#19388) - \[PERF] scrape: conversion from classic to native histograms should only parse start times when enabled. [#19446](prometheus/prometheus#19446) - \[BUGFIX] PromQL: Fix `info()` enrichment for composite expressions with mixed `@`/offset references or selector-free vector branches, preventing metadata from being evaluated at an unrelated timestamp. [#19387](prometheus/prometheus#19387) - \[BUGFIX] PromQL: Fix info() enrichment when input series use different subsets of identifying labels. [#19557](prometheus/prometheus#19557) - \[BUGFIX] PromQL: Preserve metric-name dropping through the info function when delayed name removal is enabled. [#19413](prometheus/prometheus#19413) - \[BUGFIX] TSDB: Don't silently drop samples when head garbage collection removes a series while it is being appended to. [#19272](prometheus/prometheus#19272) - \[BUGFIX] TSDB: Keep series with uncommitted samples during selected- and stale-series compaction, including when appenders overlap. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Do not retain head series after a synthetic start-timestamp zero sample is rejected. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Prevent query panics during series eviction after WAL replay. [#19664](prometheus/prometheus#19664) - \[BUGFIX] TSDB: fix potential deadlock between mmapSeriesChunks and gcSeries. [#19460](prometheus/prometheus#19460) - \[BUGFIX] TSDB: fix default block reload interval for custom options. [#19368](prometheus/prometheus#19368) - \[BUGFIX] AWS SD: Do not crash on serverless MSK clusters or MSK clusters without Open Monitoring. [#19194](prometheus/prometheus#19194) - \[BUGFIX] AWS SD: Do not panic when the ElastiCache API omits optional fields of a serverless cache or cache cluster. [#19435](prometheus/prometheus#19435) - \[BUGFIX] AWS SD: Reject non-positive `request_concurrency` instead of hanging service discovery indefinitely. [#19524](prometheus/prometheus#19524) - \[BUGFIX] Discovery/AWS: Avoid a panic when discovering standalone ECS tasks with custom task groups. [#19302](prometheus/prometheus#19302) - \[BUGFIX] Discovery: Do not panic in AWS Lightsail service discovery when an instance is missing optional fields such as availability zone, blueprint, bundle, name, state or support code. [#19324](prometheus/prometheus#19324) - \[BUGFIX] Discovery: delete the stale `prometheus_sd_last_update_timestamp_seconds` series for a config that is removed on reload. [#19131](prometheus/prometheus#19131) - \[BUGFIX] HTTP: Avoid truncating compressed responses when handlers set Content-Length. [#19661](prometheus/prometheus#19661) - \[BUGFIX] IONOS SD: Do not panic when the API response omits the server, NIC or volume collections, or a server's properties. [#19438](prometheus/prometheus#19438) - \[BUGFIX] Metadata will not affect the number of Remote Write v2 shards. [#19218](prometheus/prometheus#19218) - \[BUGFIX] Mixins: Fix label mismatches that prevented PrometheusHAGroupNotIngestingSamples and PrometheusHAGroupCrashlooping from firing. [#19444](prometheus/prometheus#19444) - \[BUGFIX] Native histograms: `DetectReset` no longer misses a counter reset when a populated bucket behind an empty one disappears, which could make histogram `rate()`/`increase()` undercount. [#19367](prometheus/prometheus#19367) - \[BUGFIX] Never skip histogram buckets for histogram\_stddev and histogram\_stdvar functions. [#19521](prometheus/prometheus#19521) - \[BUGFIX] OTLP: Do not abort an entire OTLP payload ingestion if one metric has no datapoints. [#19343](prometheus/prometheus#19343) - \[BUGFIX] PromQL: Fix FastRegexMatcher false-positive match when a capturing group is directly adjacent to a literal (e.g. `.*\|(foo)\|.*`). [#19516](prometheus/prometheus#19516) - \[BUGFIX] PromQL: Fix a panic in range selectors using the experimental `anchored` or `smoothed` modifier when the selected series has no samples inside the query window, for example a query evaluated inside a scrape gap. [#19431](prometheus/prometheus#19431) - \[BUGFIX] PromQL: Fix empty results when a subquery with `@` is used as the matrix argument of a call that is not step-invariant (for example `quantile_over_time(scalar(x), metric[...:...] @ T)`). [#19187](prometheus/prometheus#19187) - \[BUGFIX] PromQL: Make the "found duplicate series for the match group" many-to-many matching error message deterministic by sorting the two duplicate labels. [#18810](prometheus/prometheus#18810) - \[BUGFIX] PromQL: Preserve parentheses around duration literals on Expr.String() round-trip. [#19403](prometheus/prometheus#19403) - \[BUGFIX] PromQL: Reject duration-expression offsets and `@ start()` / `@ end()` before range selectors, matching the existing rejection of literal offsets and `@ <timestamp>`. [#19406](prometheus/prometheus#19406) - \[BUGFIX] PromQL: Report the position of the histogram argument rather than of a scalar argument in the native histogram NaN observation annotations of `histogram_quantile` and `histogram_fraction`. [#19330](prometheus/prometheus#19330) - \[BUGFIX] PromQL: info() now applies the @ modifier/offset when evaluating the info series, so info(v @ T) enriches as of T consistently instead of depending on the query start/eval time. [#19266](prometheus/prometheus#19266) - \[BUGFIX] Rules: Fix a panic when a rule manager created without a logger loads a rule file containing multiple YAML documents. [#19433](prometheus/prometheus#19433) - \[BUGFIX] Scrape: Do not append a stale marker for a series that is still exposed when the storage returns a new series reference for it. [#19328](prometheus/prometheus#19328) - \[BUGFIX] Scrape: JSON log formatter correctly format scrape target info. [#19472](prometheus/prometheus#19472) - \[BUGFIX] TSDB: Fix in-order chunk ID overflow by wrapping head chunk IDs modulo 2^23 so they never collide with the out-of-order flag bit. [#19450](prometheus/prometheus#19450) - \[BUGFIX] TSDB: Fix out-of-order chunk ID overflow by wrapping `firstOOOChunkID` modulo 2^23 instead of growing unbounded. [#19216](prometheus/prometheus#19216) - \[BUGFIX] UI: Remove an extraneous X-axis tick mark in the native histogram chart when using the "linear" display mode. [#19326](prometheus/prometheus#19326) - \[BUGFIX] discovery/aws: Avoid a panic when an ElastiCache ARN is missing its resource ID. [#19333](prometheus/prometheus#19333) - \[BUGFIX] discovery/aws: Do not panic on MSK clusters whose optional API fields are absent. [#19584](prometheus/prometheus#19584) - \[BUGFIX] discovery/aws: Do not panic when the EC2 API omits optional instance fields. [#19512](prometheus/prometheus#19512) - \[BUGFIX] discovery/aws: Don't panic on ECS tasks with absent optional fields. [#19396](prometheus/prometheus#19396) - \[BUGFIX] discovery/aws: MSK Optional Custom Configuration Fields [#19422](prometheus/prometheus#19422). [#19422](prometheus/prometheus#19422) - \[BUGFIX] discovery/ionos: Fix panic when the IONOS API omits optional server fields. [#19418](prometheus/prometheus#19418) - \[BUGFIX] discovery/kubernetes: Populate `__meta_kubernetes_service_loadbalancer_ip` from `status.loadBalancer.ingress`, falling back to deprecated `spec.loadBalancerIP`. [#19404](prometheus/prometheus#19404) - \[BUGFIX] histogram: Fix Compact moving buckets to wrong indices, and producing negative bucket counts for integer histograms, when more than one span is merged in the same pass. [#19312](prometheus/prometheus#19312) - \[BUGFIX] promtool: Fixed `tsdb dump` silently dropping native histogram samples. [#18051](prometheus/prometheus#18051) - \[BUGFIX] scrape: fix data race in `Manager.TargetsDroppedCounts` to avoid miscounting dropped targets. [#19304](prometheus/prometheus#19304) - \[BUGFIX] scrape: fix nil histogram when native and classic histograms are mixed in one metric family. [#19452](prometheus/prometheus#19452) - \[BUGFIX] TSDB: Fix WAL and GC log messages to emit human-readable duration strings instead of nanosecond integers. [#19307](prometheus/prometheus#19307) - \[BUGFIX] TSDB: Avoid WAL corruption after a failed WAL write in Agent mode. [#19700](prometheus/prometheus#19700) - \[BUGFIX] Agent: Ignore unknown WAL record types, to help users rolling back. [#19814](prometheus/prometheus#19814)

…→ v3.15.0) (#769) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [quay.io/prometheus/prometheus](https://github.com/prometheus/prometheus) | minor | `v3.14.0` → `v3.15.0` | --- ### Release Notes <details> <summary>prometheus/prometheus (quay.io/prometheus/prometheus)</summary> ### [`v3.15.0`](https://github.com/prometheus/prometheus/releases/tag/v3.15.0): 3.15.0 / 2026-09-24 [Compare Source](prometheus/prometheus@v3.14.0...v3.15.0) - \[CHANGE] PromQL: A range query whose `end` was not aligned to `step` caused subqueries inside it to evaluate past the parent's last actual step, inflating `peakSamples` in the query stats and against the `query.max-samples` limit, and wasting storage I/O reading samples that were never used in the result. Add tests to prevent regression of the fix made in [#18081](prometheus/prometheus#18081). [#18598](prometheus/prometheus#18598) - \[CHANGE] PromQL: Do not register a start timestamp reset if the start timestamp hasn't changed between subsequent samples. [#19454](prometheus/prometheus#19454) - \[CHANGE] Logging: Deprecate `--log.level`; use `runtime.log_level` configuration to supply the default level. [#19511](prometheus/prometheus#19511) - \[FEATURE] Configuration: Allow changing the process log level through `runtime.log_level` on configuration reload. [#19511](prometheus/prometheus#19511) - \[FEATURE] Prometheus: Add `--auto-gomemlimit.refresh-interval` flag to periodically re-detect the container or system memory limit and update `GOMEMLIMIT` at runtime. [#18843](prometheus/prometheus#18843) - \[FEATURE] Scraping: Add support for scraping targets via Unix Domain Sockets. [#12024](prometheus/prometheus#12024). [#18091](prometheus/prometheus#18091) - \[FEATURE] scrape: Implement OM2.0 scrape format. [#18606](prometheus/prometheus#18606) - \[ENHANCEMENT] Reduce TSDB head CPU utilization when initializing. [#18001](prometheus/prometheus#18001) - \[ENHANCEMENT] Docker SD: Add labels `__meta_docker_container_image` and `__meta_docker_container_image_id`. [#19386](prometheus/prometheus#19386) - \[ENHANCEMENT] Mixin: Add a p95/p99 remote-write send-batch latency panel to the remote-write dashboard. [#19500](prometheus/prometheus#19500) - \[ENHANCEMENT] Mixin: Support native histograms in the remote-write send-batch latency panel. [#19522](prometheus/prometheus#19522) - \[ENHANCEMENT] PromQL/TSDB: The `--enable-feature=st-storage` flag now automatically enables XOR2 float chunk encoding and ST-capable histogram chunk encoding, so you no longer need to pass `xor2-encoding` and `histograms-st-encoding` alongside it. [#19518](prometheus/prometheus#19518) - \[ENHANCEMENT] Remote write / Alertmanager: upgrade sigv4 to v0.5.0, adding `session_name` and `tags` fields for STS AssumeRole sessions. The previously undocumented `service_name` field is now also documented. [#19569](prometheus/prometheus#19569) - \[ENHANCEMENT] Scraping: Support zstd-compressed scrape responses, enabled via feature flag `zstd-scrape`. [#19502](prometheus/prometheus#19502) - \[ENHANCEMENT] TSDB: Stabilize the XOR2 float chunk encoding. `--enable-feature=xor2-encoding` is deprecated; use `storage.tsdb.chunk_encoding.floats: xor2` instead. Check that other software reading the TSDB directly (e.g. Thanos sidecar) supports XOR2 before enabling. [#19461](prometheus/prometheus#19461) - \[ENHANCEMENT] TSDB: add `prometheus_tsdb_head_appenders_created_total` metric. [#19411](prometheus/prometheus#19411) - \[ENHANCEMENT] Tracing: add more spans to scrapes, API queries and rule evaluations. [#19410](prometheus/prometheus#19410) - \[ENHANCEMENT] UI: Show the effective configuration for each scrape pool on the Targets and Service Discovery pages. [#19384](prometheus/prometheus#19384) - \[ENHANCEMENT] scrape: Enable start time synthesis for summary `_count` and `_sum` series in scrape appender v2. [#19323](prometheus/prometheus#19323) - \[ENHANCEMENT] scrape: stop all pools in parallel for faster shutdowns. [#19295](prometheus/prometheus#19295) - \[ENHANCEMENT] storage/remote: Add undocumented failed\_request\_logging config field to debug log remote write V2 requests on send errors. [#19249](prometheus/prometheus#19249) - \[ENHANCEMENT] TSDB: Add fast path for XOR chunk decompression to speed up queries. [#18049](prometheus/prometheus#18049) - \[ENHANCEMENT] UI: Improve native histogram table formatting and add a background bar indicating the bucket count. [#19332](prometheus/prometheus#19332) - \[ENHANCEMENT] TSDB: Add `prometheus_tsdb_head_series_pending_commit_underflow_total` to report pending-sample reservation underflows. [#19470](prometheus/prometheus#19470) - \[PERF] AWS SD: Build RDS cluster labels once per cluster instead of once per instance. [#19504](prometheus/prometheus#19504) - \[PERF] AWS SD: Describe RDS instances of different clusters concurrently, bounded by `request_concurrency`. [#19506](prometheus/prometheus#19506) - \[PERF] AWS SD: Describe each ElastiCache resource once per refresh instead of twice. [#19585](prometheus/prometheus#19585) - \[PERF] Remote read: Avoid cloning labels for sampled reads when no external labels are configured. [#19503](prometheus/prometheus#19503) - \[PERF] Remote write: Reuse OTLP converter scratch state between requests. [#19388](prometheus/prometheus#19388) - \[PERF] scrape: conversion from classic to native histograms should only parse start times when enabled. [#19446](prometheus/prometheus#19446) - \[BUGFIX] PromQL: Fix `info()` enrichment for composite expressions with mixed `@`/offset references or selector-free vector branches, preventing metadata from being evaluated at an unrelated timestamp. [#19387](prometheus/prometheus#19387) - \[BUGFIX] PromQL: Fix info() enrichment when input series use different subsets of identifying labels. [#19557](prometheus/prometheus#19557) - \[BUGFIX] PromQL: Preserve metric-name dropping through the info function when delayed name removal is enabled. [#19413](prometheus/prometheus#19413) - \[BUGFIX] TSDB: Don't silently drop samples when head garbage collection removes a series while it is being appended to. [#19272](prometheus/prometheus#19272) - \[BUGFIX] TSDB: Keep series with uncommitted samples during selected- and stale-series compaction, including when appenders overlap. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Do not retain head series after a synthetic start-timestamp zero sample is rejected. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Prevent query panics during series eviction after WAL replay. [#19664](prometheus/prometheus#19664) - \[BUGFIX] TSDB: fix potential deadlock between mmapSeriesChunks and gcSeries. [#19460](prometheus/prometheus#19460) - \[BUGFIX] TSDB: fix default block reload interval for custom options. [#19368](prometheus/prometheus#19368) - \[BUGFIX] AWS SD: Do not crash on serverless MSK clusters or MSK clusters without Open Monitoring. [#19194](prometheus/prometheus#19194) - \[BUGFIX] AWS SD: Do not panic when the ElastiCache API omits optional fields of a serverless cache or cache cluster. [#19435](prometheus/prometheus#19435) - \[BUGFIX] AWS SD: Reject non-positive `request_concurrency` instead of hanging service discovery indefinitely. [#19524](prometheus/prometheus#19524) - \[BUGFIX] Discovery/AWS: Avoid a panic when discovering standalone ECS tasks with custom task groups. [#19302](prometheus/prometheus#19302) - \[BUGFIX] Discovery: Do not panic in AWS Lightsail service discovery when an instance is missing optional fields such as availability zone, blueprint, bundle, name, state or support code. [#19324](prometheus/prometheus#19324) - \[BUGFIX] Discovery: delete the stale `prometheus_sd_last_update_timestamp_seconds` series for a config that is removed on reload. [#19131](prometheus/prometheus#19131) - \[BUGFIX] HTTP: Avoid truncating compressed responses when handlers set Content-Length. [#19661](prometheus/prometheus#19661) - \[BUGFIX] IONOS SD: Do not panic when the API response omits the server, NIC or volume collections, or a server's properties. [#19438](prometheus/prometheus#19438) - \[BUGFIX] Metadata will not affect the number of Remote Write v2 shards. [#19218](prometheus/prometheus#19218) - \[BUGFIX] Mixins: Fix label mismatches that prevented PrometheusHAGroupNotIngestingSamples and PrometheusHAGroupCrashlooping from firing. [#19444](prometheus/prometheus#19444) - \[BUGFIX] Native histograms: `DetectReset` no longer misses a counter reset when a populated bucket behind an empty one disappears, which could make histogram `rate()`/`increase()` undercount. [#19367](prometheus/prometheus#19367) - \[BUGFIX] Never skip histogram buckets for histogram\_stddev and histogram\_stdvar functions. [#19521](prometheus/prometheus#19521) - \[BUGFIX] OTLP: Do not abort an entire OTLP payload ingestion if one metric has no datapoints. [#19343](prometheus/prometheus#19343) - \[BUGFIX] PromQL: Fix FastRegexMatcher false-positive match when a capturing group is directly adjacent to a literal (e.g. `.*\|(foo)\|.*`). [#19516](prometheus/prometheus#19516) - \[BUGFIX] PromQL: Fix a panic in range selectors using the experimental `anchored` or `smoothed` modifier when the selected series has no samples inside the query window, for example a query evaluated inside a scrape gap. [#19431](prometheus/prometheus#19431) - \[BUGFIX] PromQL: Fix empty results when a subquery with `@` is used as the matrix argument of a call that is not step-invariant (for example `quantile_over_time(scalar(x), metric[...:...] @ T)`). [#19187](prometheus/prometheus#19187) - \[BUGFIX] PromQL: Make the "found duplicate series for the match group" many-to-many matching error message deterministic by sorting the two duplicate labels. [#18810](prometheus/prometheus#18810) - \[BUGFIX] PromQL: Preserve parentheses around duration literals on Expr.String() round-trip. [#19403](prometheus/prometheus#19403) - \[BUGFIX] PromQL: Reject duration-expression offsets and `@ start()` / `@ end()` before range selectors, matching the existing rejection of literal offsets and `@ <timestamp>`. [#19406](prometheus/prometheus#19406) - \[BUGFIX] PromQL: Report the position of the histogram argument rather than of a scalar argument in the native histogram NaN observation annotations of `histogram_quantile` and `histogram_fraction`. [#19330](prometheus/prometheus#19330) - \[BUGFIX] PromQL: info() now applies the @ modifier/offset when evaluating the info series, so info(v @ T) enriches as of T consistently instead of depending on the query start/eval time. [#19266](prometheus/prometheus#19266) - \[BUGFIX] Rules: Fix a panic when a rule manager created without a logger loads a rule file containing multiple YAML documents. [#19433](prometheus/prometheus#19433) - \[BUGFIX] Scrape: Do not append a stale marker for a series that is still exposed when the storage returns a new series reference for it. [#19328](prometheus/prometheus#19328) - \[BUGFIX] Scrape: JSON log formatter correctly format scrape target info. [#19472](prometheus/prometheus#19472) - \[BUGFIX] TSDB: Fix in-order chunk ID overflow by wrapping head chunk IDs modulo 2^23 so they never collide with the out-of-order flag bit. [#19450](prometheus/prometheus#19450) - \[BUGFIX] TSDB: Fix out-of-order chunk ID overflow by wrapping `firstOOOChunkID` modulo 2^23 instead of growing unbounded. [#19216](prometheus/prometheus#19216) - \[BUGFIX] UI: Remove an extraneous X-axis tick mark in the native histogram chart when using the "linear" display mode. [#19326](prometheus/prometheus#19326) - \[BUGFIX] discovery/aws: Avoid a panic when an ElastiCache ARN is missing its resource ID. [#19333](prometheus/prometheus#19333) - \[BUGFIX] discovery/aws: Do not panic on MSK clusters whose optional API fields are absent. [#19584](prometheus/prometheus#19584) - \[BUGFIX] discovery/aws: Do not panic when the EC2 API omits optional instance fields. [#19512](prometheus/prometheus#19512) - \[BUGFIX] discovery/aws: Don't panic on ECS tasks with absent optional fields. [#19396](prometheus/prometheus#19396) - \[BUGFIX] discovery/aws: MSK Optional Custom Configuration Fields [#19422](prometheus/prometheus#19422). [#19422](prometheus/prometheus#19422) - \[BUGFIX] discovery/ionos: Fix panic when the IONOS API omits optional server fields. [#19418](prometheus/prometheus#19418) - \[BUGFIX] discovery/kubernetes: Populate `__meta_kubernetes_service_loadbalancer_ip` from `status.loadBalancer.ingress`, falling back to deprecated `spec.loadBalancerIP`. [#19404](prometheus/prometheus#19404) - \[BUGFIX] histogram: Fix Compact moving buckets to wrong indices, and producing negative bucket counts for integer histograms, when more than one span is merged in the same pass. [#19312](prometheus/prometheus#19312) - \[BUGFIX] promtool: Fixed `tsdb dump` silently dropping native histogram samples. [#18051](prometheus/prometheus#18051) - \[BUGFIX] scrape: fix data race in `Manager.TargetsDroppedCounts` to avoid miscounting dropped targets. [#19304](prometheus/prometheus#19304) - \[BUGFIX] scrape: fix nil histogram when native and classic histograms are mixed in one metric family. [#19452](prometheus/prometheus#19452) - \[BUGFIX] TSDB: Fix WAL and GC log messages to emit human-readable duration strings instead of nanosecond integers. [#19307](prometheus/prometheus#19307) - \[BUGFIX] TSDB: Avoid WAL corruption after a failed WAL write in Agent mode. [#19700](prometheus/prometheus#19700) - \[BUGFIX] Agent: Ignore unknown WAL record types, to help users rolling back. [#19814](prometheus/prometheus#19814) </details> --- ### Configuration 📅 **Schedule**: (in timezone Europe/London) - 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 this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.hayden.moe/hayden/phoebe/pulls/769

…➔ v3.15.0) (#2199) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [quay.io/prometheus/prometheus](https://github.com/prometheus/prometheus) | minor | `v3.14.0` → `v3.15.0` | --- > ⚠️ **Warning** > > Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/567) for more information. --- ### Release Notes <details> <summary>prometheus/prometheus (quay.io/prometheus/prometheus)</summary> ### [`v3.15.0`](https://github.com/prometheus/prometheus/releases/tag/v3.15.0): 3.15.0 / 2026-09-24 [Compare Source](prometheus/prometheus@v3.14.0...v3.15.0) - \[CHANGE] PromQL: A range query whose `end` was not aligned to `step` caused subqueries inside it to evaluate past the parent's last actual step, inflating `peakSamples` in the query stats and against the `query.max-samples` limit, and wasting storage I/O reading samples that were never used in the result. Add tests to prevent regression of the fix made in [#18081](prometheus/prometheus#18081). [#18598](prometheus/prometheus#18598) - \[CHANGE] PromQL: Do not register a start timestamp reset if the start timestamp hasn't changed between subsequent samples. [#19454](prometheus/prometheus#19454) - \[CHANGE] Logging: Deprecate `--log.level`; use `runtime.log_level` configuration to supply the default level. [#19511](prometheus/prometheus#19511) - \[FEATURE] Configuration: Allow changing the process log level through `runtime.log_level` on configuration reload. [#19511](prometheus/prometheus#19511) - \[FEATURE] Prometheus: Add `--auto-gomemlimit.refresh-interval` flag to periodically re-detect the container or system memory limit and update `GOMEMLIMIT` at runtime. [#18843](prometheus/prometheus#18843) - \[FEATURE] Scraping: Add support for scraping targets via Unix Domain Sockets. [#12024](prometheus/prometheus#12024). [#18091](prometheus/prometheus#18091) - \[FEATURE] scrape: Implement OM2.0 scrape format. [#18606](prometheus/prometheus#18606) - \[ENHANCEMENT] Reduce TSDB head CPU utilization when initializing. [#18001](prometheus/prometheus#18001) - \[ENHANCEMENT] Docker SD: Add labels `__meta_docker_container_image` and `__meta_docker_container_image_id`. [#19386](prometheus/prometheus#19386) - \[ENHANCEMENT] Mixin: Add a p95/p99 remote-write send-batch latency panel to the remote-write dashboard. [#19500](prometheus/prometheus#19500) - \[ENHANCEMENT] Mixin: Support native histograms in the remote-write send-batch latency panel. [#19522](prometheus/prometheus#19522) - \[ENHANCEMENT] PromQL/TSDB: The `--enable-feature=st-storage` flag now automatically enables XOR2 float chunk encoding and ST-capable histogram chunk encoding, so you no longer need to pass `xor2-encoding` and `histograms-st-encoding` alongside it. [#19518](prometheus/prometheus#19518) - \[ENHANCEMENT] Remote write / Alertmanager: upgrade sigv4 to v0.5.0, adding `session_name` and `tags` fields for STS AssumeRole sessions. The previously undocumented `service_name` field is now also documented. [#19569](prometheus/prometheus#19569) - \[ENHANCEMENT] Scraping: Support zstd-compressed scrape responses, enabled via feature flag `zstd-scrape`. [#19502](prometheus/prometheus#19502) - \[ENHANCEMENT] TSDB: Stabilize the XOR2 float chunk encoding. `--enable-feature=xor2-encoding` is deprecated; use `storage.tsdb.chunk_encoding.floats: xor2` instead. Check that other software reading the TSDB directly (e.g. Thanos sidecar) supports XOR2 before enabling. [#19461](prometheus/prometheus#19461) - \[ENHANCEMENT] TSDB: add `prometheus_tsdb_head_appenders_created_total` metric. [#19411](prometheus/prometheus#19411) - \[ENHANCEMENT] Tracing: add more spans to scrapes, API queries and rule evaluations. [#19410](prometheus/prometheus#19410) - \[ENHANCEMENT] UI: Show the effective configuration for each scrape pool on the Targets and Service Discovery pages. [#19384](prometheus/prometheus#19384) - \[ENHANCEMENT] scrape: Enable start time synthesis for summary `_count` and `_sum` series in scrape appender v2. [#19323](prometheus/prometheus#19323) - \[ENHANCEMENT] scrape: stop all pools in parallel for faster shutdowns. [#19295](prometheus/prometheus#19295) - \[ENHANCEMENT] storage/remote: Add undocumented failed\_request\_logging config field to debug log remote write V2 requests on send errors. [#19249](prometheus/prometheus#19249) - \[ENHANCEMENT] TSDB: Add fast path for XOR chunk decompression to speed up queries. [#18049](prometheus/prometheus#18049) - \[ENHANCEMENT] UI: Improve native histogram table formatting and add a background bar indicating the bucket count. [#19332](prometheus/prometheus#19332) - \[ENHANCEMENT] TSDB: Add `prometheus_tsdb_head_series_pending_commit_underflow_total` to report pending-sample reservation underflows. [#19470](prometheus/prometheus#19470) - \[PERF] AWS SD: Build RDS cluster labels once per cluster instead of once per instance. [#19504](prometheus/prometheus#19504) - \[PERF] AWS SD: Describe RDS instances of different clusters concurrently, bounded by `request_concurrency`. [#19506](prometheus/prometheus#19506) - \[PERF] AWS SD: Describe each ElastiCache resource once per refresh instead of twice. [#19585](prometheus/prometheus#19585) - \[PERF] Remote read: Avoid cloning labels for sampled reads when no external labels are configured. [#19503](prometheus/prometheus#19503) - \[PERF] Remote write: Reuse OTLP converter scratch state between requests. [#19388](prometheus/prometheus#19388) - \[PERF] scrape: conversion from classic to native histograms should only parse start times when enabled. [#19446](prometheus/prometheus#19446) - \[BUGFIX] PromQL: Fix `info()` enrichment for composite expressions with mixed `@`/offset references or selector-free vector branches, preventing metadata from being evaluated at an unrelated timestamp. [#19387](prometheus/prometheus#19387) - \[BUGFIX] PromQL: Fix info() enrichment when input series use different subsets of identifying labels. [#19557](prometheus/prometheus#19557) - \[BUGFIX] PromQL: Preserve metric-name dropping through the info function when delayed name removal is enabled. [#19413](prometheus/prometheus#19413) - \[BUGFIX] TSDB: Don't silently drop samples when head garbage collection removes a series while it is being appended to. [#19272](prometheus/prometheus#19272) - \[BUGFIX] TSDB: Keep series with uncommitted samples during selected- and stale-series compaction, including when appenders overlap. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Do not retain head series after a synthetic start-timestamp zero sample is rejected. [#19470](prometheus/prometheus#19470) - \[BUGFIX] TSDB: Prevent query panics during series eviction after WAL replay. [#19664](prometheus/prometheus#19664) - \[BUGFIX] TSDB: fix potential deadlock between mmapSeriesChunks and gcSeries. [#19460](prometheus/prometheus#19460) - \[BUGFIX] TSDB: fix default block reload interval for custom options. [#19368](prometheus/prometheus#19368) - \[BUGFIX] AWS SD: Do not crash on serverless MSK clusters or MSK clusters without Open Monitoring. [#19194](prometheus/prometheus#19194) - \[BUGFIX] AWS SD: Do not panic when the ElastiCache API omits optional fields of a serverless cache or cache cluster. [#19435](prometheus/prometheus#19435) - \[BUGFIX] AWS SD: Reject non-positive `request_concurrency` instead of hanging service discovery indefinitely. [#19524](prometheus/prometheus#19524) - \[BUGFIX] Discovery/AWS: Avoid a panic when discovering standalone ECS tasks with custom task groups. [#19302](prometheus/prometheus#19302) - \[BUGFIX] Discovery: Do not panic in AWS Lightsail service discovery when an instance is missing optional fields such as availability zone, blueprint, bundle, name, state or support code. [#19324](prometheus/prometheus#19324) - \[BUGFIX] Discovery: delete the stale `prometheus_sd_last_update_timestamp_seconds` series for a config that is removed on reload. [#19131](prometheus/prometheus#19131) - \[BUGFIX] HTTP: Avoid truncating compressed responses when handlers set Content-Length. [#19661](prometheus/prometheus#19661) - \[BUGFIX] IONOS SD: Do not panic when the API response omits the server, NIC or volume collections, or a server's properties. [#19438](prometheus/prometheus#19438) - \[BUGFIX] Metadata will not affect the number of Remote Write v2 shards. [#19218](prometheus/prometheus#19218) - \[BUGFIX] Mixins: Fix label mismatches that prevented PrometheusHAGroupNotIngestingSamples and PrometheusHAGroupCrashlooping from firing. [#19444](prometheus/prometheus#19444) - \[BUGFIX] Native histograms: `DetectReset` no longer misses a counter reset when a populated bucket behind an empty one disappears, which could make histogram `rate()`/`increase()` undercount. [#19367](prometheus/prometheus#19367) - \[BUGFIX] Never skip histogram buckets for histogram\_stddev and histogram\_stdvar functions. [#19521](prometheus/prometheus#19521) - \[BUGFIX] OTLP: Do not abort an entire OTLP payload ingestion if one metric has no datapoints. [#19343](prometheus/prometheus#19343) - \[BUGFIX] PromQL: Fix FastRegexMatcher false-positive match when a capturing group is directly adjacent to a literal (e.g. `.*\|(foo)\|.*`). [#19516](prometheus/prometheus#19516) - \[BUGFIX] PromQL: Fix a panic in range selectors using the experimental `anchored` or `smoothed` modifier when the selected series has no samples inside the query window, for example a query evaluated inside a scrape gap. [#19431](prometheus/prometheus#19431) - \[BUGFIX] PromQL: Fix empty results when a subquery with `@` is used as the matrix argument of a call that is not step-invariant (for example `quantile_over_time(scalar(x), metric[...:...] @ T)`). [#19187](prometheus/prometheus#19187) - \[BUGFIX] PromQL: Make the "found duplicate series for the match group" many-to-many matching error message deterministic by sorting the two duplicate labels. [#18810](prometheus/prometheus#18810) - \[BUGFIX] PromQL: Preserve parentheses around duration literals on Expr.String() round-trip. [#19403](prometheus/prometheus#19403) - \[BUGFIX] PromQL: Reject duration-expression offsets and `@ start()` / `@ end()` before range selectors, matching the existing rejection of literal offsets and `@ <timestamp>`. [#19406](prometheus/prometheus#19406) - \[BUGFIX] PromQL: Report the position of the histogram argument rather than of a scalar argument in the native histogram NaN observation annotations of `histogram_quantile` and `histogram_fraction`. [#19330](prometheus/prometheus#19330) - \[BUGFIX] PromQL: info() now applies the @ modifier/offset when evaluating the info series, so info(v @ T) enriches as of T consistently instead of depending on the query start/eval time. [#19266](prometheus/prometheus#19266) - \[BUGFIX] Rules: Fix a panic when a rule manager created without a logger loads a rule file containing multiple YAML documents. [#19433](prometheus/prometheus#19433) - \[BUGFIX] Scrape: Do not append a stale marker for a series that is still exposed when the storage returns a new series reference for it. [#19328](prometheus/prometheus#19328) - \[BUGFIX] Scrape: JSON log formatter correctly format scrape target info. [#19472](prometheus/prometheus#19472) - \[BUGFIX] TSDB: Fix in-order chunk ID overflow by wrapping head chunk IDs modulo 2^23 so they never collide with the out-of-order flag bit. [#19450](prometheus/prometheus#19450) - \[BUGFIX] TSDB: Fix out-of-order chunk ID overflow by wrapping `firstOOOChunkID` modulo 2^23 instead of growing unbounded. [#19216](prometheus/prometheus#19216) - \[BUGFIX] UI: Remove an extraneous X-axis tick mark in the native histogram chart when using the "linear" display mode. [#19326](prometheus/prometheus#19326) - \[BUGFIX] discovery/aws: Avoid a panic when an ElastiCache ARN is missing its resource ID. [#19333](prometheus/prometheus#19333) - \[BUGFIX] discovery/aws: Do not panic on MSK clusters whose optional API fields are absent. [#19584](prometheus/prometheus#19584) - \[BUGFIX] discovery/aws: Do not panic when the EC2 API omits optional instance fields. [#19512](prometheus/prometheus#19512) - \[BUGFIX] discovery/aws: Don't panic on ECS tasks with absent optional fields. [#19396](prometheus/prometheus#19396) - \[BUGFIX] discovery/aws: MSK Optional Custom Configuration Fields [#19422](prometheus/prometheus#19422). [#19422](prometheus/prometheus#19422) - \[BUGFIX] discovery/ionos: Fix panic when the IONOS API omits optional server fields. [#19418](prometheus/prometheus#19418) - \[BUGFIX] discovery/kubernetes: Populate `__meta_kubernetes_service_loadbalancer_ip` from `status.loadBalancer.ingress`, falling back to deprecated `spec.loadBalancerIP`. [#19404](prometheus/prometheus#19404) - \[BUGFIX] histogram: Fix Compact moving buckets to wrong indices, and producing negative bucket counts for integer histograms, when more than one span is merged in the same pass. [#19312](prometheus/prometheus#19312) - \[BUGFIX] promtool: Fixed `tsdb dump` silently dropping native histogram samples. [#18051](prometheus/prometheus#18051) - \[BUGFIX] scrape: fix data race in `Manager.TargetsDroppedCounts` to avoid miscounting dropped targets. [#19304](prometheus/prometheus#19304) - \[BUGFIX] scrape: fix nil histogram when native and classic histograms are mixed in one metric family. [#19452](prometheus/prometheus#19452) - \[BUGFIX] TSDB: Fix WAL and GC log messages to emit human-readable duration strings instead of nanosecond integers. [#19307](prometheus/prometheus#19307) - \[BUGFIX] TSDB: Avoid WAL corruption after a failed WAL write in Agent mode. [#19700](prometheus/prometheus#19700) - \[BUGFIX] Agent: Ignore unknown WAL record types, to help users rolling back. [#19814](prometheus/prometheus#19814) </details> --- ### Configuration 📅 **Schedule**: (in timezone Europe/Paris) - 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 this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.erwanleboucher.dev/eleboucher/homelab/pulls/2199

fancive requested a review from a team as a code owner August 22, 2026 07:51

fancive requested a review from dswarbrick August 22, 2026 07:51

bboreham assigned krajorama Aug 25, 2026

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Comment thread scrape/scrape.go Resolved

Comment thread scrape/scrape.go Resolved

fancive force-pushed the feat-scrape-zstd branch from 0b78d74 to c758402 Compare August 26, 2026 12:36

krajorama reviewed Aug 27, 2026

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Comment thread docs/feature_flags.md Resolved

fancivez and others added 4 commits August 28, 2026 11:21

feat(scrape): support zstd-compressed responses

8d2cf9d

Signed-off-by: fancivez <[email protected]>

feat(scrape): gate zstd compression behind feature flag

139ab71

Signed-off-by: fancivez <[email protected]>

fix(scrape): limit zstd decoder window size

64e3cca

Signed-off-by: fancivez <[email protected]>

docs: move zstd feature flag entry to bottom

ebc287e

Signed-off-by: fancivez <[email protected]> Change-Id: Ic2b3c9a8bc92d2fba402da97fcb3e845602b0ff5

fancive force-pushed the feat-scrape-zstd branch from 1b95cbb to ebc287e Compare August 28, 2026 04:05

krajorama enabled auto-merge August 28, 2026 10:10

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krajorama merged commit 9606e39 into prometheus:main Aug 28, 2026
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fancive deleted the feat-scrape-zstd branch August 29, 2026 11:30

github-actions Bot mentioned this pull request Oct 19, 2026

Update prom/prometheus Docker tag to v3.15.0 claytono/infra#3239

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scrape: support zstd-compressed responses - #19502

scrape: support zstd-compressed responses#19502
krajorama merged 4 commits into
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