Labels

Must be done as soon as possible

Causes serverexit 104 to fetch this MR

[Release Candidate] MR is ready for test label and final review; Can be merged if review passes.

[Work In Progress] is still incomplete but reviewable - usually, waiting for MR author or staff to fix small bugs.

[Discussion] Discussion Pending (or otherwise not ready for review)

Discarded, or provides internal feature with test label.

Can be done at convenience