reproduce: steps:
etcdctl lease grant 100 etcdctl put a 1 --lease=00009497fc455902 etcdctl put z 2 --lease=00009497fc455902 etcdctl put l 3 --lease=00009497fc455902
wait for a few seconds
watch was canceled (rpc error: code = Unknown desc = closing transport due to: connection error: desc = "error reading from server: EOF", received prior goaway: code: ENHANCE_YOUR_CALM, debug data: too_many_pings) Error: watch is canceled by the server