We currently have metrics documentation in two different places:
1. Different pages in the Research namespace on Meta (many but not all of them in Category:Metrics https://meta.wikimedia.org/wiki/Category:Metrics). 2. mediawiki:Analytics/Metrics https://www.mediawiki.org/wiki/Analytics/Metric_definitions
To avoid duplication, which of these should be the canonical location? I lean towards Meta, since it's not just MediaWiki developers who'll be interested.
As a follow-up question, if you think it should be Meta as well, what should be the primary gateway to this documentation? Category:Metrics? An updated version of Research:Metrics https://meta.wikimedia.org/wiki/Research:Metrics? Research:Metrics standardization https://www.mediawiki.org/wiki/Analytics/Metric_definitions#Active_editor?