Convert MetricFamily labels -> list #184
Merged
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On Python 3 the labels of the
python_info
metric is a reference to thedict_keys
of the data object used to create it. This PR ensures all labelnames in MetricFamilies it are a static tuple instead.This PR is motivated by some broken tests in https://github.com/korfuri/django-prometheus with recent versions of prometheus-client: django-commons/django-prometheus#46 (comment)
Although the docs do not say Metrics should be serializable this change seems more in keeping with the intention that labels should be owned by the Metric and not a reference to an external object.