add: gossipsub metrics spec draft #695
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Warning
Don't review just yet. Still WIP
The pull requests adds a new spec for unified operational GossipSub metrics. The discussion started in libp2p/go-libp2p-pubsub#534 and was brought up in one of the P2P collaborator calls.
Different implementations expose different metrics. Some references:
My plan would be to approach this spec iteratively. This means we'll agree on very limited set of metrics first, release the spec and release updates from then on. This contrasts the approach of getting buy in from everyone for a large set of metrics. Rather start small.