Ping for this. Anyone can give some pointers for this? Thanks.
On Tuesday, April 13, 2021 at 4:41:55 PM UTC-7 chuanjia xing wrote:
> Hi there,
>
> I hit following issue when using Prometheus + Grafana, and want to
> check if this is a bug in Prometheus query.
>
> Scenario:
>
> I am using Prometheus to collect CPUUtilization for aws instances. In
> one dashboard, I want to show the metrics for services which are
> underutilized. To do this, I first use Grafana Variable
> "underutilized_services" to find out the service names; then I use this
> Variable in my Prometheus query to show the actual CPUUtilization data for
> these services.
>
> I am using following Prometheus query:
>
> "*avg by
> (service_id)($Metric{service_id=~"$underutilized_services"})*"
>
> and $underutilized_services" is a list of service names, like service1,
> service2...
>
> It is working well when the $underutilized_services is not empty,
> like folllwing (first graph)
>
> But if the $underutilized_services is empty, then my understanding is
> that it should now "No Data", but somehow it is showing something wired,
> like following (second graph).
>
> If you look at the legend of the second graph, it shows:
>
> "*avg by
> (service_id)(aws_ec2_cpuutilization_p50{service_id=~"()"})*"
>
> It looks like above query actually returns some value, which in my
> opinion it shouldn't.
>
> This is showing some confusing data for my customer. Ideally it
> should show "No Data" in the second case.
>
> Is there a bug in Prometheus? Or I am not using the query correctly?
>
>
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