This is an umbrella issue for many many packages we have under /pkg/ and /model/. Everything there should be moved under /internal/, to prevent 3rd party repositories taking dependencies (e.g. #6408).

The recommendation to contributors:

• pick one of the subpackages

• make a suggestion where to move it

  • sometimes we may want to change the paths
  • sometimes we may want to just moved the files where they are used, e.g. pkg/normalizer does not need to be a separate package

• open a PR with just that one change

• rinse and repeat

• remove pkg/metrics/metrics_test.go which was left over