In order to monitor the health of each connection from the application side, it would be great to store the last successful pong timestamp (in redis, for instance), which we could then build alerts on top of depending on our needs.

For some context, I was thinking about how the node-slack-sdk library implements a client-level ping/pong dance and memorizes that timestamp here.

After browsing through relax source code, though, I realize that you are probably relying on the lower-level gorilla websocket connection to handle that ping/pong directly at the websocket level, right?

Even if that's confirmed, it would be indeed great to be able to propagate that information to Rails etc (via Redis), for custom monitoring.

Just some thoughts :-) Keep up the good work!