Measure usage of GitLab serverless runtimes

Problem to solve

Currently, we don't measure which runtimes are used the most with GitLab serverless.

Intended users

product managers

Further details

Proposal

TBD with a couple of options

1. If functions we persist in db, we could get runtime used or
2. Evaluate contents of gitlab-ci.yml at runtime and increase runtime counter

Permissions and Security

Documentation

Testing

What does success look like, and how can we measure that?

Links / references