Using a variable to build up a query throws error

Grafana
1

Hi,

I have the following metric:

kube_system_upstream_public_cra7ccfa2b62624_alb1_responseMsec

The substring “public_cra7ccfa…_alb1” is an ID for an Application Load Balancer (ALB). I don’t want to create variables or queries using the given metric name as it is, because if I want to export my dashboard and use it in another environment where the ALB ID is different, then I would have to change that part of the metric name everywhere where its used. So I managed to isolate the ALB ID with a regex expression and assign it to a variable called “alb”. I’ m trying to use that variable as part as the metric name in a query as follows:

kube_system_upstream_$alb_responseMsec

But that gives me the following error:

Template variables could not be initialized: parse error at char 22: could not parse remaining input “$alb_responseMs”…

I also tried:

kube_system_upstream_"$alb"_responseMsec

Which gives me the following error:

Template variables could not be initialized: parse error at char 22: could not parse remaining input "“public_cra7ccf”…

Is it possible to do what I’m trying? If so, what would be the correct syntax in order for the query to be successful?

Thanks in advance!

Regards

2

There is an alternative syntax for template variables that might work better:

kube_system_upstream_[[alb]]_responseMsec

3

Hi daniellee,

Thanks for your quick response. I forgot to mention that I tried that as well, but it also fails… Any other suggestion?

4

Is this with Prometheus?

5

Hi daniellee,

Yes, it is Prometheus, but I found what was wrong, I was using [[$alb]] instead of just [[alb]] :sweat_smile:. Now it’s working, thank you!

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