There is a WIP pull request against 2.1.0-SNAPSHOT for replacing the Hadoop Metrics2 framework with Micrometer[1]. Micrometer suggests using a naming pattern[2] for the metrics internally where words are all lowercase separated by a period. Micrometer output formats then rewrite the metric names to the destination specific format. It's possible that we may not be able to produce metrics in the same exact way as the Hadoop Metrics2 framework. Metrics are not part of the public API, but we do want to try and retain as much backwards compatibility as possible. In the event that we cannot get that compatibility it has been suggested that we document how things are different. As I have limited knowledge of how the metrics are being used today, I'm looking for some feedback from the community as to how painful it would be if metric names changed in a minor release.
[1] https://micrometer.io/ [2] https://micrometer.io/docs/concepts#_naming_meters
