Forum Discussion
an alarm when vm has not been on for 30 minutes continuously.
hello, I should create an alarm when vm has not been on for 30 minutes continuously. I know it can be done somehow with heartbeats, but how? and what value I put as Threshold value? pls help me.
henry75
There are 100s of examples in the [Queries] blade in Log Analytics
You can search on the Table Name (Heartbeat in this case)
This gives an example
// Unavailable computers
// List all known computers that didn't send a heartbeat in the last 5 hours.
Heartbeat
| summarize LastHeartbeat=max(TimeGenerated) by Computer
| where LastHeartbeat < ago(5h)
Which we can modify:
// Unavailable computers
// List all known computers that didn't send a heartbeat in the last 30 mins.
Heartbeat
| summarize LastHeartbeat=max(TimeGenerated) by Computer
| where LastHeartbeat < ago(30m)
Result:
thank you so much for your help