How to diagnostic grandpa issue?

[xlc]

When grandpa stalls, it is not easy to figure out what's wrong even with -l afg=trace enabled.

I want to see:

• who are the voters
• the votes from each voters

For both completed round and current round. Currently the logs doesn't include much information about current round.

This is the log helps me. (I edited the code in cargo github registry locally to include those additional information)

DEBUG afg Round 1: precommits: 7/6/8 weight, 7/8 actual, [(Public(21b5a771b99ef0f059c476502c018c4b817fb0e48858e95a238850d2b7828556 (5CpuQ9Uj...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(2b5d678c58558507a974c6f149392b5a62cf1f76146a3210da451a220050f734 (5D3ZfR2N...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(533f3664876407fac9385416269f6c120b7c1807d6cee96f30066fb69cf99bb1 (5DwrcK1H...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(5c9ce55e9133eaea0831a403c7619fd3e5bb1dedb0cb631f948718f89d61c2cf (5EA8sSFk...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(77f3c27e98da7849ed0749e1dea449321a4a5a36a1dccf3f08fc0ab3af24c62e (5Emyy3wq...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(934ff7c3ad46d033a02cdf9788592eda74706d1f56dcd61359968f603e49ad7a (5FPrekJQ...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 }), (Public(c152550c03201bff2bc62d10c827f58509f8d8e3d977040dc17e1bf869cab305 (5GSBZEwY...)), Precommit { target_hash: 0x803f88fefd791df512cf7e7b4b36d2bb65f2375616e36e478e9f8a57e2cb48d2, target_number: 32609 })]

This is especially useful to diagnostic issue caused by validator participating babe but not grandpa.

[bkchr]

Duplicate of #4921