# What this PR does
Improves OpenAPI schema coverage for internal API:
- Fixes/Improves `alert group` and `feature` endpoints
- Adds `integration` and `user` endpoints
## Which issue(s) this PR fixes
https://github.com/grafana/oncall/issues/3444
## 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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