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feat(notifications-slack): add scope-based message update support

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When a Backstage notification is re-sent with the same scope, the
notifications backend updates the existing DB record and sets
notification.updated. Previously, the SlackNotificationProcessor always
called chat.postMessage(), creating duplicate Slack messages.

This adds database-backed scope-based update support:

- New slack_message_timestamps table to persist Slack message ts values
  keyed by (scope, channel)
- After each chat.postMessage(), store the response ts in the database
- When postProcess receives a notification with updated set and a
  matching stored ts, use chat.update() instead of chat.postMessage()
- Scope context is passed as parameters through the call chain to avoid
  race conditions with concurrent postProcess calls
- Scheduled daily cleanup of old timestamp records (24h retention)
- New messagesUpdated metrics counter for observability
- Graceful degradation when no database is provided
- Explicitly picks only supported fields for chat.update calls

Signed-off-by: Erik Miller <erik.miller@gusto.com>
This commit is contained in:
Erik Miller
2026-03-27 16:53:12 -07:00
parent e32a4cabb4
commit f399a7acab
8 changed files with 650 additions and 22 deletions
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.changeset/slack-scope-message-updates.md
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'@backstage/plugin-notifications-backend-module-slack': patch
---
Added scope-based message update support. When a notification is re-sent with the same `scope` and `notification.updated` is set, the processor now calls `chat.update()` on the existing Slack message instead of sending a duplicate via `chat.postMessage()`. Message timestamps are persisted in a new `slack_message_timestamps` database table with automatic daily cleanup. The processor gracefully degrades to the previous behavior when no database is provided.