Max Inden 79fc16e4d7 client/finality-grandpa: Add Prometheus metrics to GossipValidator (#5237)
* client/finality-grandpa: Add Prometheus metrics to GossipValidator

Instrument finality grandpa `GossipValidator` exposing count of messages
validated by message type and message action.

```
\# HELP substrate_finality_grandpa_communication_gossip_validator_messages Number of messages validated by the finality grandpa gossip validator.
\# TYPE substrate_finality_grandpa_communication_gossip_validator_messages counter
substrate_finality_grandpa_communication_gossip_validator_messages{action="discard",message="neighbor"} 39
substrate_finality_grandpa_communication_gossip_validator_messages{action="keep",message="vote"} 28
```

* client/finality-grandpa: Add None as Prometheus registry in tests

* client/finality-granpda/src/communication: Refactor metric registration
2020-03-14 12:51:44 +01:00
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