GitHub issue:

https://github.com/openshift/openshift-docs/issues/46482

Which section(s) is the issue in?

Persistent storage prerequisites

What needs fixing?

From OCP 4.10, the number of replicas for Alertmanager has changed 3 to 2 *1.

So that, the following should be fixed

Make sure you have a persistent volume (PV) ready to be claimed by the persistent volume claim (PVC), one PV for each replica. Because Prometheus has two replicas and Alertmanager has three two replicas, you need five four PVs to support the entire monitoring stack. The PVs should be available from the Local Storage Operator. This does not apply if you enable dynamically provisioned storage.

*1: openshift/cluster-monitoring-operator@4996004