Levels:
- "non blocker"
- "for suggestion"
- "minor blocker"
- "major blocker"
https://www.netlify.com/blog/2020/03/05/feedback-ladders-how-we-encode-code-reviews-at-netlify/
- Dust: "Take it or leave it"
- Sand "Future consideration"
- Pebble "Future action"
- Boulder "Blocking"
- Mountain "Blocking + Immediate Action"