Implement RegisteredMetricsFilter (#15) #148
Merged
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This implements a filter that makes it possible to define a set of metrics in an external file and enforce that only those metrics are emitted. This is helpful to reduce typos and improve documentation of metrics.
This takes a structure rather than a path to an external file. In this way, it makes it generic allowing users to define metrics in whatever way they find most convenieng. e.g. JSON, YAML, Python, etc.
Fixes #15.