Event Search hotspots not displaying

Hotspots by Node, AlertKey not displaying.

Problem

If the Hotspots by Node, Alert Group and AlertKey chart fails to display in the Last_Month->Operational Status Dashboard the SOLR heap size might need increasing.

Resolution

Increase the the SOLR heap size.
Note: The Hotspots by Node, Alert Group and AlertKey chart is CPU intensive and can be slow to render for systems with a large amount of data.