fix(prometheus): Ensure the operator is operating in the control plane

Author: the2hill

base-helm-configs/prometheus/prometheus-helm-overrides.yaml

@@ -2601,7 +2601,8 @@ prometheusOperator:
   ## Define which Nodes the Pods are scheduled on.
   ## ref: https://kubernetes.io/docs/user-guide/node-selection/
   ##
-  nodeSelector: {}
+  nodeSelector:
+    openstack-control-plane: enabled
 
   ## Tolerations for use with node taints
   ## ref: https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/