Is there a way to define default for a metric by default if not present

[varunvijayagopal]

We use istio_requests_total for scaling . However this metric comes into picture only when we try to hit endpoint of service .
/stats/proemetheus endpoint doesn't give this metric by default .
Since we use this hpa , it comes as UNKNOWN till that service is accessed .
I tried to add vector(0) so that if not present it gives a counter of 0 and this works fine on prometheus but still prometheus adapter complains with 404

Below is the query which we ar esuing

seriesQuery: istio_requests_total{destination_service_name!="",reporter="destination", destination_workload_namespace!=""}
resources:
overrides:
destination_service_name: { resource: "service" }
destination_workload_namespace: { resource: "namespace" }
name:
matches: "^(.*)_total"
as: "${1}_per_second"
metricsQuery: 'sum(rate(<<.Series>>{reporter="destination", <<.LabelMatchers>>}[1m]) or vector(0)) by (<<.GroupBy>>)'

[dgrisonnet]

/kind support
/triage accepted
/assign

[huguesgr]

I'm interested in this, have you found a workaround?

[dgrisonnet]

I don't think this was ever fixed

[huguesgr]

I found something that works in my use-case:

metricsQuery: <<.Series>>{<<.LabelMatchers>>} or clamp_max(absent(<<.Series>>{<<.LabelMatchers>>}),0)

[k8s-triage-robot]

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/remove-triage accepted