Expose metrics for pac controller deadlock/performace alerts (#4389)

Signed-off-by: divyansh42 <[email protected]>

components/monitoring/prometheus/base/monitoringstack/monitoringstack.yaml

@@ -107,6 +107,8 @@ spec:
         - '{__name__="tekton_pipelines_controller_pipelinerun_duration_seconds_count"}'
         - '{__name__="watcher_workqueue_depth"}'
         - '{__name__="watcher_client_latency_bucket"}'
+        - '{__name__="pac_watcher_work_queue_depth"}'
+        - '{__name__="pac_watcher_client_latency_bucket"}'
         - '{__name__="grpc_server_handled_total", namespace=~"tekton-results|openshift-pipelines"}'
         - '{__name__="grpc_server_handling_seconds_bucket", namespace=~"tekton-results|openshift-pipelines"}'
         - '{__name__="controller_runtime_reconcile_errors_total", namespace!~".*-tenant|openshift-.*|kube-.*"}'