Hard code expected labels on obsreport tests (#1083)
Hard code expected labels on obsreport tests (#1083)

* Hard code expected labels on obsreport tests

The goal is to prevent inadvertent changes of the labels. Using hard coded values requires manual changes of the tests.

* Add reason to be careful about metric name and label changes
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector