Expose new registry Google CDN redirect metrics
This MR exposes the new application metrics exported by the Container Registry whenever the Google Cloud CDN feature is enabled:
The screenshot above was taken during tests in Staging with the <code data-sourcepos="7:67-7:97">container_registry_cdn_redirect</code> feature flag set to 50%. The bulk of requests originated on my local machine, with some from within GCP (bypassed to GCS).
These metrics were introduced in gitlab-org/container-registry!830 (merged).
Related to https://gitlab.com/groups/gitlab-org/-/epics/7212 and https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/14934.
Edited by João Pereira