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RELEASE NOTESPROMETHEUSVERIFIED

PUBLISHER UPDATE · ALERTMANAGER-0.33.0

ALERTMANAGER-0.33.0 release notes and known issues

0.33.0 / 2026-06-12

Scope: Prometheus Alertmanager. This update record adds version, fix and known-issue context. Its publication date is not a lifecycle boundary.

Summary

[CHANGE] The '--enable-feature=auto-gomaxprocs' option has been removed. This flag had no effect since v0.29 and was deprecated in v0.32. It can be safely removed from any startup scripts. #5090 , #5251 [CHANGE] Add group-key-in-metrics feature flag. #5047 [CHANGE] Move AlertMarker , GroupMarker to marker package. #5047 [CHANGE] Remove alertmanager_marked_alerts . #5047 [CHANGE] Remove the following from types package: MemMarker , AlertState* , AlertStatus . #5047 [FEATURE] Introduce per aggregation group AlertMarkers and drop Global Alert Marker. #5047 [FEATURE] ui: Add support for silence annotations. #5017 [FEATURE] api: Add receiver labels and receiver_matchers filter to /api/v2/receivers , /api/v2/alerts , and /api/v2/alerts/groups . #5152 [FEATURE] eventrecorder: Add structured event recorder behind --enable-feature=event-recorder , with file, webhook, and kafka outputs. #5072 , #5246 [ENHANCEMENT] Add the use_aws_http_client config option to the sns notifier. #5178 [ENHANCEMENT] template: Add now function to get current time. #5188 [ENHANCEMENT] docs: Clarify YAML quoting vs matcher token quoting in UTF-8 matchers section. #5264 [BUGFIX] jira: Allow disabling the resolve transition when resolve_transition is not set. #4821 [BUGFIX] jira: Include unresolved issues in wont_fix_resolution JQL to prevent duplicate issue creation. #5185 [BUGFIX] sns: Support the AWS_CA_BUNDLE env variable for the sns notifier. #5178

Improvements and security content

  • [CHANGE] The '--enable-feature=auto-gomaxprocs' option has been removed. This flag had no effect since v0.29 and was deprecated in v0.32. It can be safely removed from any startup scripts. #5090 , #5251 [CHANGE] Add group-key-in-metrics feature flag. #5047 [CHANGE] Move AlertMarker , GroupMarker to marker package. #5047 [CHANGE] Remove alertmanager_marked_alerts . #5047 [CHANGE] Remove the following from types package: MemMarker , AlertState* , AlertStatus . #5047 [FEATURE] Introduce per aggregation group AlertMarkers and drop Global Alert Marker. #5047 [FEATURE] ui: Add support for silence annotations. #5017 [FEATURE] api: Add receiver labels and receiver_matchers filter to /api/v2/receivers , /api/v2/alerts , and /api/v2/alerts/groups . #5152 [FEATURE] eventrecorder: Add structured event recorder behind --enable-feature=event-recorder , with file, webhook, and kafka outputs. #5072 , #5246 [ENHANCEMENT] Add the use_aws_http_client config option to the sns notifier. #5178 [ENHANCEMENT] template: Add now function to get current time. #5188 [ENHANCEMENT] docs: Clarify YAML quoting vs matcher token quoting in UTF-8 matchers section. #5264 [BUGFIX] jira: Allow disabling the resolve transition when resolve_transition is not set. #4821 [BUGFIX] jira: Include unresolved issues in wont_fix_resolution JQL to prevent duplicate issue creation. #5185 [BUGFIX] sns: Support the AWS_CA_BUNDLE env variable for the sns notifier. #5178

Known issues

Publisher statement

Not stated. The verified publisher record does not contain a known-issues statement.

Affected products and versions

Products

  • Prometheus Alertmanager

Affected versions

  • 0.33.0
  • 0.29
  • 0.32

Fixed versions or updates

  • No fixed version is stated in this record.

Recommended action

Review the official publisher document before deployment.

Official publisher evidence

PROMETHEUSVERIFIED

0.33.0 / 2026-06-12

Checked 29 Sep 2026. BlackTree preserves the last verified facts if a later source check is temporarily unavailable.

Open the official publisher source