Used on the values chart: https://github.com/helm/charts/blob/ae20c58892be40e742577bcfae14348f3d9e6645/stable/prometheus-operator/values.yaml#L1010 https://github.com/helm/charts/blob/ae20c58892be40e742577bcfae14348f3d9e6645/stable/prometheus-operator/values.yaml#L1003