If you no longer wish to monitor a MySQL server you can remove it from the Dashboard. There is no provision for deleting an active server from the Dashboard—to remove a server you must make it inactive by stopping the agent.
For instructions on stopping an agent see:
Once the agent is stopped you may delete the monitored server. Deleting a server simply means that it will no longer show up in the Dashboard.
Remove a server by choosing the Settings tab and then the Manage Servers link. Find the server you wish to remove and delete it by clicking the delete link. Deleting a server from the All Servers group or from any other group will remove it from the Dashboard entirely.
A delete link will not be available for an active server. You must stop the agent before this link will appear.
You may remove a server from any group at any time. Removing the last server from a group also removes that group.