Check replica counts, image cache, and workspace startup

Check replica counts, image-cache DaemonSets, and workspace startup time so that you can confirm optimization changes are working.

Before you begin

Verify that OpenShift Dev Spaces server components are running with the expected replica count:
```
$ oc get deployment -n openshift-devspaces \
  -o custom-columns='NAME:.metadata.name,REPLICAS:.spec.replicas,AVAILABLE:.status.availableReplicas'
```
All components should show the configured number of replicas in the AVAILABLE column.
If you enabled the Kubernetes Image Puller, verify that the DaemonSet is running on all schedulable nodes:
```
$ oc get daemonset -n openshift-devspaces -l app=kubernetes-image-puller
```
The DESIRED and READY columns should show the same number, matching your schedulable node count.
Verify that the pre-cached images are present on a node by checking the DaemonSet pod logs:
```
$ oc logs -n openshift-devspaces -l app=kubernetes-image-puller --tail=5
```
Start a workspace and observe the startup time. With image pre-caching enabled, workspaces on nodes that have the DaemonSet pod should start within 30 seconds.

Verify overall platform health:

$ oc get pods -n openshift-devspaces -o custom-columns='NAME:.metadata.name,READY:.status.containerStatuses[*].ready,STATUS:.status.phase'

All pods should show Running status with all containers ready.