Bugfix

Top priority, MR fixes critical problem affecting existing installations and must be reviewed, tested and merged as soon as possible

Proposal is discussed

Code cleanup. Non-functional changes not affecting existing behavior, like code formatting

High priority. MR fixes bug affecting existing installations. Though the workaround exists, MR should be processed in priority order

Proposal is finalized and is ready to implementation

functional changes improving existing feature or adding new one

Normal priority. MR should be processed in usual order

Implementation is in-progress

Non-functional changes, including code and infrastructure optimization, requirements updates or additional documentation

Low priority. Insignificant cosmetic changes which can be processed in background order

Feature is implemented and merged to master

Trivial changes which can take up to 5 minutes to review and up to 15 minutes to test

Research and development. May lead to feature or improvement issue

Proposal is rejected or replaced by more generalized solution

Changes which can take up to 1 hour to test

Most complicated changes

Changes which can take up to 1 day to test