[exp] metrics over libp2p streams #3110
Draft
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Allows a node to expose its metrics to another libp2p node. Only allow listed peer ids can query the metrics.
This enables a user to share their metrics with us, and for us to use our own grafana+prometheus stack to ingest those metrics.
A couple more things are left to do here. In draft until those are done. I may split the ergonomic auth to a separate PR.