If for some reason an alert is removed or renamed, the monitoring job or dashboard alert cannot find the missing alert. The following approaches will be taken to resolve the situation.
For monitoring – An error email is sent. An explanation is included, e.g. alert <ALERT_NAME> not found in the template <TEMPLATE_NAME>.
For dashboard alert – An error icon is displayed in the template header. If you mouse over the error icon, you will see error message explaining the problem. If you are using the Dashboard Builder at that time, you can fix the problem immediately.
If a monitor check is missed,because server was not running, it will run immediately after the server is started. Each missed task will only run once, even when more checks were missed. After the missed monitoring jobs were run, checks will be performed as before according to their schedule.