deprecated-helm-charts/incubator/prometheus/README.md

incubator/prometheus is deprecated in favor of the stable/prometheus.

Note: this chart was previously moved from incubator to stable before a deprecated version was published to this helm repo. Therefore, in order to remove the old versions from aggregators such as Helm Hub and Artifact Hub we have re-added this placeholder deprecated chart. See https://github.com/helm/charts/issues/23128 for further details.