Problems

• With feat: add ipni checks #66, we now get providers from the IPNI, however the Check backend only supports probing peers that support Bitswap, since both transport-graphsync-filecoinv1 and transport-ipfs-gateway-http are unsupported by both Boxo, Kubo and Rainbow.
• The IPNI sometimes return duplicate providers (see screenhot)
• Since we limit the number of providers we test to 10, we often end up in a situation where we get multiple unactionable providers from the IPNI and don't test any providers from the DHT (because it's usually slower to respond) and the loop exits once the max has reached, irrespective of the source of providers.

Example

Potential solutions

• limit the number of providers from each source (DHT/IPNI) so that we always try to get providers from both
• Skip providers that only transport-graphsync-filecoinv1 and [transport-ipfs-gateway-http]
• Deduplicate providers from the IPNI so that we only test distinct PeerIDs once