Hi Stuart,

Thank yo so much for your quick response! I would like to go more details for 
it.

(1) Is there any official documentation has mentioned about this mechanism?
(2) The default look back interval is 5 minutes. Is it configurable for 
Prometheus and promtool during the unit testing for alert? 

Honestly, I still couldn’t understand why Prometheus has this mechanism. Just 
for this test case, it didn’t make sense to keep firing an alert during the 3m 
to 7m, as the time series metrics has already gone. 

Thank you so much!

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