Unrelated question. But may be someone knows enough. Is it possible to create high-available wireguard server? Like I put load balancer on UDP :51820 before servers and then those servers somehow share a session pool, so when one goes down, another can continue serving clients without interruptions.

Naive approach does not work: wireguard establishes connection and if backend server changes, this connection stuck for a few minutes until wireguard decided to establish new connection. Persistent Keep Alive does not help for some reason. Eventually it'll re-establish new session and will work from now on, but this delay is unacceptable.