The client logs full SDP stanzas, which include local IP addresses.
When the websocket server panics (as in #29125 (moved)), it writes the client IP address to the log:
{{{
2019/01/18 18:56:29 http2: panic serving X.X.X.X:YYYY: interface conversion: *http2.responseWriter is not http.Hijacker: missing method Hijack
}}}
The websocket server logs an IP address on certain connection errors. (These are probably automated scanners, but still...)
{{{
2019/04/01 07:02:50 http: TLS handshake error from X.X.X.X:YYYY: acme/autocert: missing server name
2019/04/01 07:53:03 http: TLS handshake error from X.X.X.X:YYYY: tls: oversized record received with length 21536
}}}
The broker logs the raw bytes of ICE answers:
{{{
2019/03/22 06:28:32 Received answer: [XXX XXX XXX XXX ... XXX]
}}}