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By failed I assume the logs are not being sent to Splunk.

You can create an alert for the same considering the last time you received logs from that particular source type/host.

There is a command - metadata which can be used for this purpose.

Metadata gives you the first/last/recent events that were seen for the host/source/ source type that you specify.

It would look something like this:

| metadata type=sourcetypes index="xyz" 

Result :

firstTime    lastTime     recentTime        sourcetype    

1561540299 1563419672 1563419673  ActiveD

1561544581 1563419705 1563419705 win

 You can just convert the time and subtract it with the present time.
 This works. You can refer: https://docs.splunk.com/Documentation/Splunk/7.1.7/SearchReference/Metadata for better understanding.
 

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