Are you getting any data when you run the
aws_ec2_cpuutilization_p50{service_id=~"()"} query?
The query above should return all the underlying time-series that were used
to compute the values you're seeing in the 2nd screenshot.
Might be also good to share which version of Prometheus + Grafana you're
running.
On Thursday, April 15, 2021 at 12:23:24 PM UTC+8 [email protected] wrote:
> 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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