HelixObs / herald / 26234000546

push

github

feat: add notifications page deep-link to Slack alerts and GitHub issues

- Add NotificationsURL field to Message and SCMParams, built as
  {uiBase}/notifications?instrument_id={id}&fingerprint={fp}
- Slack Block Kit: add "Manage Silences" button to every alert message
  and to suppression digest messages
- Suppression digests now render as Block Kit (same layout as primary
  alerts) instead of plain text
- GitHub issue body footer: add "Manage silences" hyperlink

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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