Grafana k8s Monitoring (Helm Chart)

What's Changed

• cherrypick spanmetrics update by @rlankfo in https://github.com/grafana/k8s-monitoring-helm/pull/1861

Full Changelog: https://github.com/grafana/k8s-monitoring-helm/compare/k8s-monitoring-2.0.40...k8s-monitoring-2.0.41