On Thu, Apr 16, 2020 at 12:05 PM Rico <[email protected]> wrote:
> So for the first query I have posted, must look likes this :
>
> avg((irate(http_server_requests_duration_seconds_sum{application="database-api",
>
> namespace="front-search-engine",path!="/ping",path!="/health",path!="/metrics",path!="/healthcheck",status="200"}[1m])
> > 0)
> /
> (irate(http_server_requests_duration_seconds_count{application="database-api",
>
> namespace="front-search-engine",path!="/ping",path!="/health",path!="/metrics",path!="/healthcheck",status="200"}[1m])
> > 0))
>
>
One word of caution here: if I see this correctly, you are taking the
average of multiple averages, which is usually incorrect:
https://math.stackexchange.com/questions/95909/why-is-an-average-of-an-average-usually-incorrect
If your goal is to calculate the overall average latency of your service,
you will want to just sum up over all sums and counts before doing the
division (and then you can omit the outer avg()). You probably don't need
the > 0 bit either then, so the whole expression would just become:
sum(irate(xxx_sum{...}[1m]))
/
sum(irate(xxx_count{...}[1m]))
Btw., you can also abbreviate:
path!="/ping",path!="/health",path!="/metrics",path!="/healthcheck"
...to just:
path!~"/(ping|metrics|healthcheck)"
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