How “Reviewers” feature can be enabled for github.com repo?

Question

Recently Github introduced feature allowing request a review. It is supposed to look like this:

However when I push a pull request, the reviewers area is disabled (it's grey and gear icon is missing):

How can reviewers feature be enable for a Github repository?

Answer 1

You can't set or request reviewers if you don't have write access to the project. You must be a maintainer to set it. If you are a maintainer you can use GitHub codeowners file to automaticially add reviewers when someone opens the PR: https://help.github.com/en/articles/about-code-owners