# What this PR does
- gracefully retry
`apps.alerts.tasks.delete_alert_group.delete_alert_group` when hitting
Slack ratelimits
- remove Slack messages from the DB as soon as they are deleted from
Slack, so the tasks are not retrying perpetually
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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