SORU/Metrics: metrics for refutation games

Owner

@antoine.lanco

What

Add new metric to rollup node for monitoring refutation game (state of the refutation, number of conflicts)

How

In refutation_game.ml, I found information on the current status of the game. For the number of conflict, I used in refutation_coordinator the number of ongoing_game.

Manually testing the MR

If you want to check the MR for now, you should import the new grafana as a dashboard and also add a new target to your prometheus data base. The target you must add in your prometheus.yml is http://localhost:9944. I've kept a draft commit that modify a tezt so that the rollup node is always on the port 9944.

dune exec tezt/tests/main.exe -- -f sc_rollup.ml -t 'Alpha: arith - refutation games winning strategies (pvm_proof_2)' -v

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR