# What this PR does
Adds a new filter on alert groups page that allows to filter alert
groups by escalation chain.
<img width="1204" alt="Screenshot 2023-03-13 at 22 42 00"
src="https://user-images.githubusercontent.com/20116910/224848730-ef753856-a050-4acb-ba36-498d2bca2b4f.png">
## Which issue(s) this PR fixes
This should be useful on it's own as it's giving more filtering
capabilities, but it also could be useful for
https://github.com/grafana/oncall/issues/1300, if PD rulesets are
migrated to a single integration with multiple escalation chains.
## Checklist
- [x] Tests updated
- [x] `CHANGELOG.md` updated