How to create an alert for offline servers¶
When any instance goes offline for 5 minutes¶
The following example is a check that will monitor the online status of all FusionReactor instances using your Cloud license.
Any instance which has been offline for over five minutes will stop being counted as offline by the check.
To more reliably monitor the online status of a specific job/instance, see the check below.
It's also possible the graph will say no data when you are editing your check. This simply means no instances have gone offline within the time frame shown.
This check relies on the function Unless, which returns the value from 5 minutes ago when no data is present now.
The Online (up) series is generated by FusionReactor, indicating that it is online. Therefore, if the instance was online 5 minutes ago, but isn't online now, it is offline and data will be returned. The condition is met so an alert will be fired.
When a single job goes offline for 5 minutes¶
This example monitors the online status of an instance, and sends an alert if it goes offline.
If you choose more than one Job or Instance with these alert conditions, then all of the selected jobs/instances must be offline for an alert to fire.
It's possible the graph will say no data when you are editing your check. This simply means the selected instance has not been offline within the time frame shown.
The important parts here are:
the function Absent, which returns 1 when no data is present, and the filter labels.
The Online (up) series is generated by FusionReactor, indicating that it is online. No data will be present when the instance is offline, so the absent function will return a 1 and cause an alert to be fired.
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