Thanks brian .. that answers most of my questions ... Regarding using [15m]
in the increase we have purposely kept it [2m] that runs for 15 minutes
since we are really tracking something continuously to be true all the time
to trigger an alert as opposed to only once .

On Mon, Mar 9, 2020 at 5:07 AM Brian Candler <b.cand...@pobox.com> wrote:

> BTW, I think that rule would be more robust against missing values by using
>
> expr: increase(metric_name[15m]) == 0
>
> instead of using "for:".  If you use "for:" then the condition must be
> true for every single evaluation, and a single missed sample may reset the
> alert.
>
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