Use multiprocess_mode max for migrations Gauges#499
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By default, when using prometheus client in a multiprocess mode, Gauges export a separate time series per pid. For migrations gauges, it makes more sense to have a single timeseries for all processes, calculated by taking a maximum of all values.
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Migration exports lead to infinitely growing cardinality metrics when using prometheus in the multiprocess mode. Disabling until the issue is addressed in the library code See: django-commons/django-prometheus#498 and: django-commons/django-prometheus#499
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By default, when using prometheus client in a multiprocess mode, Gauges
export a separate time series per pid. For migrations gauges, it makes
more sense to have a single timeseries for all processes, calculated by
taking a maximum of all values.
Closes #498