There are two different types of alerts which ACM Observability can capture: # Those generated by the rules on the hub cluster

1. Those generated by an alertmanager a spoke cluster and forwarded to the hub cluster.

From ACM Alerting UI, can only see the alerts of the first category and can't see alert of the second category.

From hub cluster, All Clusters->Infrastructures, open grafana, can see the all the alerts  by query 'ALERTS', see screen shot

 From ACM alerting UI, find alerts from spoke cluster are missing, see screenshot