gerritbot currently checks whether each PR has a "cla: yes" label (using the maintner corpus, so it doesn't contribute to GitHub API rate limit use) to determine that CLA checks have passed before importing the PR into Gerrit:

ghr.ForeachIssue(func(issue *maintner.GitHubIssue) error {
	// ...
	if /* ... */ || !issue.HasLabel("cla: yes") {
		return nil
	}
	// ...
}

(Source.)

The "cla: yes" and "cla: no" labels have been applied by @googlebot, but are in the process of being deprecated in favor of PR checks (see example). At some point, the "cla: yes" labels will stop being applied, and then gerritbot won't keep importing new PRs automatically, even when the CLAs have been signed.

This issue tracks the work to update gerritbot to use the new mechanism to check that a PR meets the CLA criteria before importing it.

CC @golang/release.