Note: these guidelines were written for Bugzilla, Mono uses GitHub issues now.

When filing a bug against Mono, here are the guidelines for determining the severity of a bug.

Blocker

• Regressions which stop Mono developers from moving forward with trunk development
• Build breakages
• This severity should only be added by a developer on the Mono team

Critical

• All other regressions on supported functionality which are not Blockers

Major

• Bugs that cause the runtime to crash
• Bugs that make the runtime unusable
• Significant bugs what block the next point release

Normal

• Non-crashing Bugs found in existing supported functionality
• Memory leaks

Minor

• Bugs and regressions in features that are not yet supported functionality
• Nuisances
• Performance issues that don’t meet the “unusable” standard
• Cosmetic graphical issue
• Fine tuning

Enhancement

• “Would be nice to have” Feature requests
• All functionality that is not currently implemented