[ZEPPELIN-6694] Reap dead websocket connections via pong tracking - #5500

[ZEPPELIN-6694] Reap dead websocket connections via pong tracking#5500

tbonelee merged 2 commits into

apache:masterapache/zeppelin:masterfrom

JangAyeon:ZEPPELIN-6694JangAyeon/zeppelin:ZEPPELIN-6694Copy head branch name to clipboard