https://issues.redhat.com/browse/ACM-15420

observability/observability_enable.adoc

@@ -574,9 +574,13 @@ Update the `multicluster-observability-operator` resource by setting `enableMetr
 spec:
   imagePullPolicy: Always
   imagePullSecret: multiclusterhub-operator-pull-secret
-  observabilityAddonSpec: # The ObservabilityAddonSpec defines the global settings for all managed clusters which have observability add-on enabled
-    enableMetrics: false #indicates the observability addon push metrics to hub server
+  observabilityAddonSpec: <1>
+    enableMetrics: false <2>
+  workers: <3> 
 ----
+<1> Use the `observabilityAddonSpec` parameter to define the global settings for all managed clusters that have the observability add-on enabled.
+<2> Use the `enableMetrics` parameter to indicate that the observability add-on is enabled to push metrics to hub cluster server.
+<3> Use the `workers` parameter to list worker nodes into the metric collector process to shard federate requests made to Prometheus on your hub cluster. Then the metric collector sends sperate remote-write requests to Thanos on your hub cluster.  
 
 [#disabling-observability-on-a-single-cluster]
 === Disabling observability on a single cluster

release_notes/acm_whats_new.adoc

@@ -84,6 +84,8 @@ For other Application topics, see link:../applications/app_management_overview.a
 
 * You can now use the _Advanced search_ option from the console by selecting the *Advanced search* drop-down button. Specify your query and receive results that match the exact strings that you enter and range-based search parameters. See link:../console/search_console.adoc#search-customization[Search customization and configurations].
 
+* Use the new `workers` parameter in the `ObservabilityAddOn` custom resource definition to add more worker nodes into the metric collector procress to shard federate requests made to your hub cluster. See link:../observability/observability_enable.adoc#enabling-observability-service[Enabling the observability service].
+
 See link:../observability/observe_environments_intro.adoc#observing-environments-intro[Observability service introduction].
 
 [#governance-whats-new]