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**What this PR does / why we need it**: - Add `eq` function - Add example for nested if and `AND`/`OR` logic **Which issue(s) this PR fixes**: Fixes #<issue number> N/A **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/upgrading/_index.md`