Thanks! Very much appreciated
On Mon, Oct 4, 2021, 21:34 Brian Candler <[email protected]> wrote:
> On Monday, 4 October 2021 at 19:25:01 UTC+1 Dan S wrote:
>
>> Brian, even better - great.
>>
>> Now that you mentioned how count() returns no labels - it relates to
>> another alert rule I was trying to implement.
>> If I wanted to alert anytime a counter is incremented (and have it self
>> resolve after x time), this seems to do it:
>>
>> *count(exception_total) - count(exception_total offset 1h) *
>> {} 0
>>
>
> At first glance, that expression will always alert, so you'll want to wrap
> it in (....) > 0
>
> But are you sure you want "count" there? It implies that you will get
> multiple *timeseries* for exception_total. If it's a single metric, then
> you want
>
> (metric_total - metric_total offset 1h) > 0
>
>
>
>> above returns a zero value when it has been incremented but no labels or
>> useful results otherwise, but this other query I happened upon returns
>> labels and I don't understand why
>>
>> *exception_total unless exception_total offset 1h*
>>
>> exception_total{pod="x"} 1
>> exception_total{pod="y"} 1
>> exception_total{pod="z"} 1
>>
>>
> Compare these two expressions separately:
>
> (A) exception_total
>
> (B) exception_total offset 1h
>
> You'll only get a result if (A) has a timeseries but (B) has no
> corresponding timeseries (meaning with exactly the same labels).
>
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