Grafana Persistence

The problem: Grafana data not being persisted when set up in accordance with Grafana documentation.

Per the Grafana docs, adding this config should enable persisting data via a database:

monitoring:
  values:
    grafana:
      grafana.ini:
        database:
          type: "postgres"
          host: "postgresql-database.bigbang.svc.cluster.local:5432/grafana"
          user:
           envFrom:
             - secretRef:
                 name: postgres-creds
          password:
            envFrom:
              - secretRef:
                  name: postgres-creds

But the "monitoring-monitoring-grafana" ConfigMap doesn't seem to pick up these changes and the grafana.ini values remain the same from the chart defaults.