Description

Today we faced the problem with counter export in openmetrics format: counter names keep being appended by "_total" suffices, one time for every new labelset.

This is how it looks in grafana metric browser after being collected by prometheus

Debug

The problem seems to be around the line
https://github.com/vesari/common/blob/6a86956d41af916f0c048f4988d93994bb865b9e/expfmt/openmetrics_create.go#L255
which modifies metric name inside the loop,

and was introduced in this commit.

Affected versions

github.com/prometheus/common v0.50.0