SUSE-SU-2025:4481-1

This update for golang-github-prometheus-alertmanager fixes the following issues:

• Update to version 0.28.1 (jsc#PED-13285):
  • Improved performance of inhibition rules when using Equal labels.
  • Improve the documentation on escaping in UTF-8 matchers.
  • Update alertmanager_config_hash metric help to document the hash is not cryptographically strong.
  • Fix panic in amtool when using --verbose.
  • Fix templating of channel field for Rocket.Chat.
  • Fix rocketchat_configs written as rocket_configs in docs.
  • Fix usage for --enable-feature flag.
  • Trim whitespace from OpsGenie API Key.
  • Fix Jira project template not rendered when searching for existing issues.
  • Fix subtle bug in JSON/YAML encoding of inhibition rules that would cause Equal labels to be omitted.
  • Fix header for slack_configs in docs.
  • Fix weight and wrap of Microsoft Teams notifications.
• Upgrade to version 0.28.0:
  • CVE-2025-47908: Bump github.com/rs/cors (bsc#1247748).
  • Templating errors in the SNS integration now return an error.
  • Adopt log/slog, drop go-kit/log.
  • Add a new Microsoft Teams integration based on Flows.
  • Add a new Rocket.Chat integration.
  • Add a new Jira integration.
  • Add support for GOMEMLIMIT, enable it via the feature flag --enable-feature=auto-gomemlimit.
  • Add support for GOMAXPROCS, enable it via the feature flag --enable-feature=auto-gomaxprocs.
  • 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.
  • Muted alerts now show whether they are suppressed or not in both the /api/v2/alerts endpoint and the Alertmanager UI.
• Upgrade to version 0.27.0:
  • API: Removal of all api/v1/ endpoints. These endpoints now log and return a deprecation message and respond with a status code of 410.
  • UTF-8 Support: Introduction of support for any UTF-8 character as part of label names and matchers.
  • Discord Integration: Enforce max length in message.
  • Metrics: Introduced the experimental feature flag --enable-feature=receiver-name-in-metrics to include the receiver name.
  • Metrics: Introduced a new gauge named alertmanager_inhibition_rules that counts the number of configured inhibition rules.
  • Metrics: Introduced a new counter named alertmanager_alerts_supressed_total that tracks muted alerts, it contains a reason label to indicate the source of the mute.
  • Discord Integration: Introduced support for webhook_url_file.
  • Microsoft Teams Integration: Introduced support for webhook_url_file.
  • Microsoft Teams Integration: Add support for summary.
  • Metrics: Notification metrics now support two new values for the label reason, contextCanceled and contextDeadlineExceeded.
  • Email Integration: Contents of auth_password_file are now trimmed of prefixed and suffixed whitespace.
  • amtool: Fixes the error scheme required for webhook url when using amtool with --alertmanager.url.
  • Mixin: Fix AlertmanagerFailedToSendAlerts, AlertmanagerClusterFailedToSendAlerts, and AlertmanagerClusterFailedToSendAlerts to make sure they ignore the reason label.