metrics in go-libp2p

[p-shahi]

go-lipp2p has added metrics libp2p/go-libp2p#1356 across many components for better observability and debug-ability

Users have already found this effort useful. In order to widely announce this feature and showcase how to observe metrics (with examples), we should have an accompanying blog post.

[p-shahi]

@sukunrt Would you be up for taking this on?

[sukunrt]

I'll give it a try

[BigLep]

I'm reopening because:

1. I made some adjustments in Update metrics-in-go-libp2p.md #105
2. I think we should provide more context arouund the "public dashboards": https://github.com/libp2p/go-libp2p/blob/master/dashboards/README.md#public-dashboards

About the dashboards:

1. It's great we have these - thanks!
2. In https://github.com/libp2p/go-libp2p/blob/master/dashboards/README.md#public-dashboards, lets add more context about these. Maybe something along the lines of:

These metrics come from one of the public IPFS DHT [bootstrap nodes](https://docs.ipfs.tech/concepts/nodes/#bootstrap) run by Protocol Labs.  At least of 202308, these nodes handle many connections across various libp2p implementations, versions, and. configurations.  They don't handle large file transfers.   

Concerning the dashboards themselves (e.g., https://protocollabs.grafana.net/public-dashboards/fce8fdeb629742c89bd70f0ce38dfd97?orgId=1 )

I'm missing context when I load it. A couple of things:

1. Change to "go-libp2p Autonat" rather than "libp2p autonat"?
2. Can we add a text panel that points back https://github.com/libp2p/go-libp2p/blob/master/dashboards/README.md#public-dashboards ? Basically something like See https://github.com/libp2p/go-libp2p/blob/master/dashboards/README.md#public-dashboards for more context.

[p-shahi]

These metrics come from one of the public IPFS DHT [bootstrap nodes](https://docs.ipfs.tech/concepts/nodes/#bootstrap) run by Protocol Labs.  At least of 202308, these nodes handle many connections across various libp2p implementations, versions, and. configurations.  They don't handle large file transfers.   

Thanks! added: libp2p/go-libp2p#2508

@sukunrt can you address the points about dashboard naming and the text panel?

[sukunrt]

Thanks @BigLep for the suggestions. This context will be helpful for users.

Does this look good?
https://protocollabs.grafana.net/public-dashboards/fce8fdeb629742c89bd70f0ce38dfd97?orgId=1

[p-shahi]

It lgtm, @BigLep I'm going to close this, please re-open if something is amiss