chore(package): update docker.io/prom/prometheus docker tag to v3.8.0

Renovate Botrequested to merge
renovate_docker.io-prom-prometheus-3.x into main

This MR contains the following updates:

Package Update Change
docker.io/prom/prometheus minor v3.7.2 -> v3.8.0

Release Notes

prometheus/prometheus (docker.io/prom/prometheus)

v3.8.0: 3.8.0 / 2025-11-28

Compare Source

Note for users of Native Histograms

This is the first release with Native Histograms as a stable feature. However, scraping Native Histograms has to be activated explicitly via the scrape_native_histograms config setting (newly introduced in this release). To ease the transition, the --enable-feature=native-histograms flag is not a complete no-op in this release, but changes the default value of scrape_native_histograms to true. In the next release (v3.9), the feature flag will be a complete no-op, and the default value of scrape_native_histograms will always be false. If you have been using the feature flag so far, the recommended course of action is the following:

  1. Upgrade to v3.8 and keep the feature flag. Everything should work as before.
  2. At your own pace, set scrape_native_histograms to true in all relevant scrape configs. (There is a global and a per-scrape-config version of scrape_native_histograms, allowing granular control if needed. It is a good idea to also set scrape_native_histograms explicitly to false where you do not want to scrape Native Histograms. In this way, you do not depend on the default value of the setting anymore.)
  3. Remove the feature flag and make sure that everything still works as intended.
  4. Now you are ready for an upgrade to the next release (v3.9).

Changelog

  • [CHANGE] Remote-write 2 (receiving): Update to 2.0-rc.4 spec. "created timestamp" (CT) is now called "start timestamp" (ST). #​17411
  • [CHANGE] TSDB: Native Histogram Custom Bounds with a NaN threshold are now rejected. #​17287
  • [FEATURE] OAuth2: support jwt-bearer grant-type (RFC7523 3.1). #​17592
  • [FEATURE] Dockerfile: Add OpenContainers spec labels to Dockerfile. #​16483
  • [FEATURE] SD: Add unified AWS service discovery for ec2, lightsail and ecs services. #​17046
  • [FEATURE] Native histograms are now a stable, but optional feature, use the scrape_native_histograms config setting. #​17232 #​17315
  • [FEATURE] UI: Support anchored and smoothed keyword in promql editor. #​17239
  • [FEATURE] UI: Show detailed relabeling steps for each discovered target. #​17337
  • [FEATURE] Alerting: Add urlQueryEscape to template functions. #​17403
  • [FEATURE] Promtool: Add Remote-Write 2.0 support to promtool push metrics via the --protobuf_message flag. #​17417
  • [ENHANCEMENT] Clarify the docs about handling negative native histograms. #​17249
  • [ENHANCEMENT] Mixin: Add static UID to the remote-write dashboard. #​17256
  • [ENHANCEMENT] PromQL: Reconcile mismatched NHCB bounds in Add and Sub. #​17278
  • [ENHANCEMENT] Alerting: Add "unknown" state for alerting rules that haven't been evaluated yet. #​17282
  • [ENHANCEMENT] Scrape: Allow simultaneous use of classic histogram → NHCB conversion and zero-timestamp ingestion. #​17305
  • [ENHANCEMENT] UI: Add smoothed/anchored in explain. #​17334
  • [ENHANCEMENT] OTLP: De-duplicate any target_info samples with the same timestamp for the same series. #​17400
  • [ENHANCEMENT] Document use_fips_sts_endpoint in sigv4 config sections. #​17304
  • [ENHANCEMENT] Document Prometheus Agent. #​14519
  • [PERF] PromQL: Speed up parsing of variadic functions. #​17316
  • [PERF] UI: Speed up alerts/rules/... pages by not rendering collapsed content. #​17485
  • [PERF] UI: Performance improvement when getting label name and values in promql editor. #​17194
  • [PERF] UI: Speed up /alerts for many firing alerts via virtual scrolling. #​17254
  • [BUGFIX] PromQL: Fix slice indexing bug in info function on churning series. #​17199
  • [BUGFIX] API: Reduce lock contention on /api/v1/targets. #​17306
  • [BUGFIX] PromQL: Consistent handling of gauge vs. counter histograms in aggregations. #​17312
  • [BUGFIX] TSDB: Allow NHCB with -Inf as the first custom value. #​17320
  • [BUGFIX] UI: Fix duplicate loading of data from the API speed up rendering of some pages. #​17357
  • [BUGFIX] Old UI: Fix createExpressionLink to correctly build /graph URLs so links from Alerts/Rules work again. #​17365
  • [BUGFIX] PromQL: Avoid panic when parsing malformed info call. #​17379
  • [BUGFIX] PromQL: Include histograms when enforcing sample_limit. #​17390
  • [BUGFIX] Config: Fix panic if TLS CA file is absent. #​17418
  • [BUGFIX] PromQL: Fix histogram_fraction for classic histograms and NHCB if lower bound is in the first bucket. #​17424

v3.7.3: 3.7.3 / 2025-10-29

Compare Source

  • [BUGFIX] UI: Revert changed (and breaking) redirect behavior for -web.external-url if -web.route-prefix is configured, which was introduced in #​17240. #​17389
  • [BUGFIX] Fix federation of some native histograms. #​17299 #​17409
  • [BUGFIX] promtool: check config would fail when --lint=none flag was set. #​17399 #​17414
  • [BUGFIX] Remote-write: fix a deadlock in the queue resharding logic that can lead to suboptimal queue behavior. #​17412

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Edited by Simon Cornet

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