tendermint/p2p/docs/trustmetric.md

The trust metric tracks the quality of the peers. When a peer exceeds a certain quality for a certain amount of time, it is marked as vetted in the addrbook. If a vetted peer's quality degrades sufficiently, it is booted, and must prove itself from scratch. If we need to make room for a new vetted peer, we move the lowest scoring vetted peer back to unvetted. If we need to make room for a new unvetted peer, we remove the lowest scoring unvetted peer - possibly only if its below some absolute minimum ?

Peer quality is tracked in the connection and across the reactors. Behaviours are defined as one of: - fatal - something outright malicious. we should disconnect and remember them. - bad - any kind of timeout, msgs that dont unmarshal, or fail other validity checks, or msgs we didn't ask for or arent expecting - neutral - normal correct behaviour. unknown channels/msg types (version upgrades). - good - some random majority of peers per reactor sending us useful messages