Update docker.io/prom/alertmanager Docker tag to v0.28.0

v0.28.0: 0.28.0 / 2025-01-15

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• [CHANGE] Templating errors in the SNS integration now return an error. #​3531 #​3879
• [CHANGE] Adopt log/slog, drop go-kit/log #​4089
• [FEATURE] Add a new Microsoft Teams integration based on Flows #​4024
• [FEATURE] Add a new Rocket.Chat integration #​3600
• [FEATURE] Add a new Jira integration #​3590 #​3931
• [FEATURE] Add support for GOMEMLIMIT, enable it via the feature flag --enable-feature=auto-gomemlimit. #​3895
• [FEATURE] Add support for GOMAXPROCS, enable it via the feature flag --enable-feature=auto-gomaxprocs. #​3837
• [FEATURE] Add support for limits of silences including the maximum number of active and pending silences, and the maximum size per silence (in bytes). You can use the flags --silences.max-silences and --silences.max-silence-size-bytes to set them accordingly #​3852 #​3862 #​3866 #​3885 #​3886 #​3877
• [FEATURE] Muted alerts now show whether they are suppressed or not in both the /api/v2/alerts endpoint and the Alertmanager UI. #​3793 #​3797 #​3792
• [ENHANCEMENT] Add support for content, username and avatar_url in the Discord integration. content and username also support templating. #​4007
• [ENHANCEMENT] Only invalidate the silences cache if a new silence is created or an existing silence replaced - should improve latency on both GET api/v2/alerts and POST api/v2/alerts API endpoint. #​3961
• [ENHANCEMENT] Add image source label to Dockerfile. To get changelogs shown when using Renovate #​4062
• [ENHANCEMENT] Build using go 1.23 #​4071
• [ENHANCEMENT] Support setting a global SMTP TLS configuration. #​3732
• [ENHANCEMENT] The setting room_id in the WebEx integration can now be templated to allow for dynamic room IDs. #​3801
• [ENHANCEMENT] Enable setting message_thread_id for the Telegram integration. #​3638
• [ENHANCEMENT] Support the since and humanizeDuration functions to templates. This means users can now format time to more human-readable text. #​3863
• [ENHANCEMENT] Support the date and tz functions to templates. This means users can now format time in a specified format and also change the timezone to their specific locale. #​3812
• [ENHANCEMENT] Latency metrics now support native histograms. #​3737
• [ENHANCEMENT] Add full width to adaptive card for msteamsv2 #​4135
• [ENHANCEMENT] Add timeout option for webhook notifier. #​4137
• [ENHANCEMENT] Update config to allow showing secret values when marshaled #​4158
• [ENHANCEMENT] Enable templating for Jira project and issue_type #​4159
• [BUGFIX] Fix the SMTP integration not correctly closing an SMTP submission, which may lead to unsuccessful dispatches being marked as successful. #​4006
• [BUGFIX] The ParseMode option is now set explicitly in the Telegram integration. If we don't HTML tags had not been parsed by default. #​4027
• [BUGFIX] Fix a memory leak that was caused by updates silences continuously. #​3930
• [BUGFIX] Fix hiding secret URLs when the URL is incorrect. #​3887
• [BUGFIX] Fix a race condition in the alerts - it was more of a hypothetical race condition that could have occurred in the alert reception pipeline. #​3648
• [BUGFIX] Fix a race condition in the alert delivery pipeline that would cause a firing alert that was delivered earlier to be deleted from the aggregation group when instead it should have been delivered again. #​3826
• [BUGFIX] Fix version in APIv1 deprecation notice. #​3815
• [BUGFIX] Fix crash errors when using url_file in the Webhook integration. #​3800
• [BUGFIX] fix Route.ID() returns conflicting IDs. #​3803
• [BUGFIX] Fix deadlock on the alerts memory store. #​3715
• [BUGFIX] Fix amtool template render when using the default values. #​3725
• [BUGFIX] Fix webhook_url_file for both the Discord and Microsoft Teams integrations. #​3728 #​3745
• [BUGFIX] Fix wechat api link #​4084
• [BUGFIX] Fix build info metric #​4166
• [BUGFIX] Fix UTF-8 not allowed in Equal field for inhibition rules #​4177