Release v0.28.0

[SuperQ]

• [CHANGE] Templating errors in the SNS integration now return an error. Return error when TmplText errors in sns notifier #3531 Return error when TmplText errors in sns notifier #3879
• [CHANGE] Adopt log/slog, drop go-kit/log chore!: adopt log/slog, drop go-kit/log #4089
• [FEATURE] Add a new Microsoft Teams integration based on Flows feat(3920): add msteamsv2 receiver #4024
• [FEATURE] Add a new Rocket.Chat integration feat: add rocketchat notifier #3600
• [FEATURE] Add a new Jira integration jira integration #3590 chore: refactor the JIRA notifier #3931
• [FEATURE] Add support for GOMEMLIMIT, enable it via the feature flag --enable-feature=auto-gomemlimit. feat(env): Add automatic memory limit handling #3895
• [FEATURE] Add support for GOMAXPROCS, enable it via the feature flag --enable-feature=auto-gomaxprocs. feat(env): add auto go maxprocs #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 Add limits for silences #3852 Limits should include expired silences #3862 Fix TestSilenceLimits tests #3866 Silence limits as functions #3885 Rename silence limit to max-silence-size-bytes #3886 Fix MaxSilences limit causes incomplete updates of existing silences #3877
• [FEATURE] Muted alerts now show whether they are suppressed or not in both the /api/v2/alerts endpoint and the Alertmanager UI. #3513: Mark muted alerts #3793 #3513: Show muted alerts in the Alert Groups API #3797 #3513: Add GroupMarker interface #3792
• [ENHANCEMENT] Add support for content, username and avatar_url in the Discord integration. content and username also support templating. Extend discord messages with content #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. bugfix: only increment Silences version if a silence is added #3961
• [ENHANCEMENT] Add image source label to Dockerfile. To get changelogs shown when using Renovate Add image source label to dockerfiles #4062
• [ENHANCEMENT] Build using go 1.23 Update Go to 1.23 #4071
• [ENHANCEMENT] Support setting a global SMTP TLS configuration. Support default SMTP TLS config #3732
• [ENHANCEMENT] The setting room_id in the WebEx integration can now be templated to allow for dynamic room IDs. Allow webex roomID from template #3801
• [ENHANCEMENT] Enable setting message_thread_id for the Telegram integration. Enable setting ThreadId for Telegram notifications #3638
• [ENHANCEMENT] Support the since and humanizeDuration functions to templates. This means users can now format time to more human-readable text. feat: add time helpers #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. Add date and tz functions to templates #3812
• [ENHANCEMENT] Latency metrics now support native histograms. feat: add optional native histogram support to latency metrics #3737
• [ENHANCEMENT] Add timeout option for webhook notifier. Add timeout option for webhook notifier. #4137
• [BUGFIX] Fix the SMTP integration not correctly closing an SMTP submission, which may lead to unsuccessful dispatches being marked as successful. fix: close SMTP submission correctly to handle errors #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. fix(telegram): passing ParseMode when sending message #4027
• [BUGFIX] Fix a memory leak that was caused by updates silences continuously. bugfix: fix leaking of Silences matcherCache entries #3930
• [BUGFIX] Fix hiding secret URLs when the URL is incorrect. Fix: Hide config.SecretURL 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. Fix race conditions in the memory alerts store #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. Fix race condition in dispatch.go #3826
• [BUGFIX] Fix version in APIv1 deprecation notice. Fix version in APIv1 deprecation notice #3815
• [BUGFIX] Fix crash errors when using url_file in the Webhook integration. notify/webhook: Fix crash on errors when url_file is used (#3798) #3800
• [BUGFIX] fix Route.ID() returns conflicting IDs. Fix Route.ID() returns conflicting IDs #3803
• [BUGFIX] Fix deadlock on the alerts memory store. Fix for deadlock issue #3682 #3715
• [BUGFIX] Fix amtool template render when using the default values. amtool template render improve default data #3725
• [BUGFIX] Fix webhook_url_file for both the Discord and Microsoft Teams integrations. fix: discord & msteams webhook_url_file configuration #3728 Send a slice of values to callback function instead of references #3745
• [BUGFIX] Fix wechat api link Updated wechat api link #4084
• [BUGFIX] Fix build info metric Fix build info metric #4166

[GreenRover]

For when is the release scheduled?

[dprittie]

@SuperQ - is it too late to get #4135 or #4160 into this release?

The issue either of those PRs solves was highlighted in #4024 (#4024 (comment)) but I think just accidentally missed.

I think for many people the new msteamsv2 receiver feature is functionally useless in production as it will cause receivers of MS Teams notifications to lose alert data depending on line lengths/screen widths.

[SuperQ]

I'll take a look, I have two other PRs that might be worth getting in.