Do we want to create new service to separate responsibility of metrics update?

The following discussion from !17994 (merged) should be addressed:

• @ayufan started a discussion: (+6 comments)

  This allow thingy seems extensive to write and maintain, can we make it more compact?

Interesting discussion here: !17994 (comment 229831524) Do we want to create new service to separate responsibility of metrics update? The answer is not clear yet. Just have this issue to track the thinking and discussion..