When a Data Collector is no longer needed, it is best to remove it so as not to allow for unwanted error messages concerning system state and to properly maintain an efficient environment. This article describes how to do this.
How do I delete a Data Collector (DC) from the CA Performance Center data collector list?
All supported Performance Management releases
The following is the process to properly remove a Data Collector. These steps can be taken before, or after, uninstalling the Data Collector.
NOTE: Do NOT delete an IP Domain before removing an unwanted Data Collector. If the IP Domain associated to the Data Collector is removed/deleted before the Data Collector, the Data Collector removal then requires database commands and a Data Aggregator services restart. This is avoidable by removing the Data Collector first, then the IP Domain may be deleted.
If the Data Collector has already had the IP Domain it relates to deleted, this REST based removal of the Data Collector will fail. Please engage support for database commands to assist with a Data Collector removal in that scenario.
When that is completed the Data Collector should get removed from the DA:/rest/dcms page and should also be gone from the Performance Management web UI.