We have found the source of the problem.
The PromQL query is wrong because the dividend is not interpreted by the
division.
Exemple:
For this query :
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
PromQL split this query in to part
First part:
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
Result : 0 # because 0/xxxx always return 0
And the next step is :
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
The result is just the value of the irate greater than 0.
So the right PromQL query must be
(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)
And then the result is OK [image: :beers:]
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))
Best regards
Le jeudi 16 avril 2020 10:30:38 UTC+2, Rico a écrit :
>
> Hello
> I have a question about a query. When I made this PromQL expression :
>
> 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)
>
> I have this result:
>
> 0.6882829615020314
>
> And when I removed the > 0 from the dividend I have a different result
> and I cannot undestand why...
> Expression :
>
> 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])
> /
> 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)
>
> Result :
>
> 0.025240713195708097
>
> Does anyone here know why ? Thanks for your support [image: :+1:]
>
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