# What this PR does
Changes UserNotificationPolicyLogRecord to success when
slack_prevent_posting is set as the user has already been notified in
slack or another method in their personal notification preferences.
These entries have also been filtered out of the alert group history
timeline as they were causing confusion to users thinking notifications
failed when in fact they had already been sent.
## Which issue(s) this PR closes
https://github.com/grafana/support-escalations/issues/13236
## 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] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
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