-post on gerrit that an issue is ready to be promoted
-reviewers (recommend at least two) check the changes
-issue is promoted by one of the reviewers
I do not know too much about Gerrit yet, but what I have seen follows this flow (aside from the documentation). Egit uses Gerrit, and I have followed a few issues. The system will not allow a promotion to master unless all reviewers agree and the tests have passed. You can also post reasons for a non-pass of review, then reset the state to require re-review.