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I am exposing metrics to Prometheus in an existing app that uses Dropwizard, and they have a wide variety of names. From app_metric_some_count to appMetric.someCount. For legacy monitoring reasons I am unable to rename these metrics.
When attempting to use a CustomMappingSampleBuilder to map these existing names to metric names that align with Prometheus best practices, I am unable to do so because both MappingConfig and GraphiteNamePattern (used within the CustomMappingSampleBuilder) expect via regex a very particular form of metric naming - app_example will not survive validation, but app.example will.
Given that Dropwizard itself does not enforce these metric naming conventions, I'm unsure as to why simpleclient_dropwizard does.