The 0.91.2 bump had been sitting in Git unapplied because the app could not
generate manifests. Once the values path was fixed it applied, and Grafana
crash-looped on "Datasource provisioning error: data source not found".
Rolled back; Grafana and all 35 VMRules are healthy again on 0.77.0.
0.91.2 also moves the default dashboards and rules out of the Helm render
into a runtime sync-job, so upgrading needs a values migration and a
verified datasource config rather than a version bump.