It would be really useful to have a scale of how willing a project is to accept contributions. You'd have a sense of how likely your patch or bug report is going to be acted on.
miniblog.
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Do you think language/API docs websites should support comments?
Pros: Adds context, familiar format, engages community
Cons: Can disincentivise contributions, comments might promote bad practices
I've only seen PHP and clojuredocs offer this.
Should we incentivise open source contributions more?
"You use feature FOO a lot! You're probably an expert, have you considered helping with FOO issue triage on our bug tracker [link]?"
Encouraging power users to contribute back could certainly help when communities grow.
Quantifying Gnome contributions by frequency, tenure, and affiliated companies:
https://hpjansson.org/blag/2020/12/16/on-the-graying-of-gnome/
Whilst the methodology can't be perfect, it's a nice way of measuring contribution trends.