InnerSource health metrics (when a project is ready for contribution)

## Feature Request

### Description of Problem:
...what *problem* are you trying to solve that the project doesn't currently solve?

...please resist the temptation to describe your request in terms of a solution. Job Story form ("When [triggering condition], I want to [motivation/goal], so I can [outcome].") can help ensure you're expressing a problem statement.

### Potential Solutions:
...clearly and concisely describe what you want to happen. Add any considered drawbacks.

... if you've considered alternatives, clearly and concisely describe those too.

No repository files, tests, or entry points are named. First clarify the InnerSource health problem, the metrics or contribution-readiness criteria required, and the expected outcome before identifying an implementation scope and acceptance tests.

Written by the indexing model from the issue text.