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What this PR does / why we need it:

Since #19246 the sidecar image would resolve to <registry-mirror>/docker.io/kiwigrid/k8s-sidecar when a global registry mirror was defined.

This commit handles the registry properly, the same way as all the other docker hub images.

Which issue(s) this PR fixes:

Special notes for your reviewer:

I have tested this using helm template. Without a global registry the output is unchanged. With a global registry, it is now resolved properly.

Checklist

  • Reviewed the CONTRIBUTING.md guide (required)
  • Documentation added
  • Tests updated
  • Title matches the required conventional commits format, see here
    • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
  • Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
  • If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR
@Scrumplex Scrumplex requested a review from a team as a code owner October 31, 2025 21:44
Since grafana#19246 the sidecar image would
resolve to registry-mirror.example.com/docker.io/kiwigrid/k8s-sidecar
when a global registry mirror was defined.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
@Scrumplex Scrumplex force-pushed the fix/helm/sidecar-global-registry branch from 8de306b to 3553219 Compare October 31, 2025 21:59
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