Sometimes customer want to clean up the System Overview page and/or the application db from because:
- They dismissed one or more Ops Manager server running Application servers or backup daemon components
- Their hostnames / domains have changed over the time
- Their hostnames have changed from lowercase to capital letters or vice versa because upgrading Ops Manager brought a JVM providing different values for getHostname() (this happens often in Windows environment).

It would be nice to have a button or at least an API call similar to the project reset duplicates that forces Ops Manager to refresh the internal host mappings and the appstate.