Function protocols_path 

pub fn protocols_path(store: &Path) -> PathBuf

<store>/mesh/protocols.json, {"<member key>": Mismatch}: the members whose last session ended at the handshake because they speak another session protocol (borg-mesh sync.rs ALPN), so nothing syncs with them. Written by the mesh daemon; borg doctor names each one. A session with the member that completes drops its record, and so does a membership that no longer lists it.