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Expose host property from prometheus/common
PR Description
In https://github.com/prometheus/common/pull/549 I add the possibility to define a custom HTTP header. I would like to use that feature in Grafana Alloy as well.
Which issue(s) this PR fixes
Notes to the Reviewer
PR Checklist
- [x] CHANGELOG.md updated
- [x] Documentation added
- [x] Tests updated
- [ ] Config converters updated
Over to @grafana/grafana-alloy-maintainers for code review
Ping for review? @grafana/grafana-agent-maintainers