Update docker.io/prom/alertmanager Docker tag to v0.34.0

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Update docker.io/prom/alertmanager Docker tag to v0.34.0
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No issues with this by means of Docker-compose YAML automated GitOps minor update of the Alertmanager Docker container and on the K3s Kubernetes cluster by means of Flux with dependency update facilitated by Mend's Renovate Bot.

This MR contains the following updates:

Package Update Change
docker.io/prom/alertmanager minor v0.33.1 → v0.34.0

Release Notes

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

v0.34.0: 0.34.0 / 2026-08-16

Compare Source

  • [CHANGE] notify: The reason label on alertmanager_notifications_failed_total now distinguishes authError (HTTP 401/403) and rateLimited (HTTP 429) from the generic clientError. Dashboards/alerts matching reason="clientError" for these codes must be updated. #​5332
  • [FEATURE] Add optional templatable labels to alert routes. #​5328
  • [FEATURE] eventrecorder: Add inhibit rule names to inhibition_muted_alert events. #​5315
  • [FEATURE] eventrecorder: Add stdout output type. #​5311
  • [FEATURE] silences: Add active, expired, and pending boolean filter parameters to GET /api/v2/silences to allow filtering silences by state server-side. #​5406
  • [FEATURE] sns: Add aws external_id support in sigv4 configuration. #​5157
  • [FEATURE] template: Add toDate and mustToDate functions. #​5327
  • [ENHANCEMENT] doc: Add AlertmanagerClusterFailedPeers alertmanager-mixin. #​5301
  • [ENHANCEMENT] doc: Add description for Rocketchat parameters in global config. #​5181
  • [ENHANCEMENT] doc: Add top level tracing configuration key. #​5314
  • [ENHANCEMENT] doc: Fix Alertmanager port in amtool config routes example. #​5312
  • [ENHANCEMENT] eventrecorder: Add optional webhook batching. #​5392
  • [ENHANCEMENT] notify: The discord and webex integrations now report a failure reason on alertmanager_notifications_failed_total. #​5332
  • [ENHANCEMENT] ui: Improve responsiveness of UI when loading thousands of alerts. #​5357
  • [BUGFIX] eventrecorder: Fixed a minor performance regression when the event recorder is enabled. #​5307
  • [BUGFIX] msteamsv2: Inherit global proxy_url into partial http_config. #​5379
  • [BUGFIX] webhook: Keep custom payload string values verbatim instead of reinterpreting JSON leaves that look like YAML (e.g. values ending with a colon). #​5304

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