Tasks:

• Capture v0.37 baseline metrics (Optional, to do only if existing v0.37 metrics can't be reused)
• Improve files with intructions as the tests are run
  • Changes to QA related files (e.g., method.md) #878
• qa: Capture v0.38 pre-release metrics
  • QA: 200-node test #841
  • QA: rotating node test #842
• qa: impact of length/presence of vote extensions #843
• Validate that there's no meaningful, substantial regression from v0.37 to v0.38
  • Fix all major issues found

DoD:

• Report is reviewed and merged
• No major bugs standing on v0.38.x

Original issue: tendermint/tendermint#9921