upgrade prometheus_client to 0.6.0 #3357
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What does this PR do?
the upgrade to prometheus_client 0.6.0 breaks so many tests in #3275 .
this current PR tries to investigate and adapt our code so we can upgrade prometheus_client from 0.3.0 to 0.6.0
More context:
The reason behind tests failure is this commit prometheus/client_python@a4dd93b it makes counter metric name not have _total internally. released since 0.4.0 prometheus/client_python#300 , we rely on the function
text_fd_to_metric_families(changed in 0.4.0) in our openmetrics logic which is used by multiple integrationsMotivation
same motivation as #3275