Improve requirements for Prometheus Operator
prometheus-operator requires a configured ingress and cert-manager to be
installed in the cluster. Make this explicit rather than implicit.
@@ -23,6 +23,10 @@ instances.
[built-in](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#types-of-persistent-volumes)
plugins.
+* An ingress controller such as [Contour](contour.md) for HTTP ingress.
+
+* The [cert-manager component](cert-manager.md) is required for enabling HTTPS.
+
## Configuration
Prometheus Operator component configuration example:
