I have doubt regarding alert configuration for transaction down. I have set the playack interval for transaction to 5 minutes, evaluation frequency for alert to 5 minutes and alert wait time(trigger condition exists for) to 3 minutes. Is this configuration correct?
If not, can anybody suggest the correct configuration since i am not getting alerts at right time.
There are three timers you need to consider here:
Going with the timers in your original post:
You got the alert at T11 when you were expecting it at T9.
You can use a 5 min timer for the evaluation frequency but you may run into weird issues with timing. (i.e. if you are polling at T0,T5,T10 but the alert is checking at T4,T9,T14 - the transaction could be down for 4 minutes before the alert even checks it.)
(Edit: Thinking about it further I'm not 100% sure about the timer condition being met at T9 or T11 as I have never had someone use a condition shorter than the alert evaluation frequency... happy for someone to correct me here)
If you used the default 1 minute evaluation:
From the above, with a timer condition shorter than the polling interval the system doesn't have time to collect a second metric of whatever you are monitoring. Therefore you should use a timer condition longer than the polling interval.
Recommendation 1 - if you want to put in a "condition must exists for" timer, make it longer than the polling interval. Otherwise you just delay the alert.
Recommendation 2 - Use a shorter evaluation frequency.
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