CONTROLLER_WAIT event is undocumented
Recently (somewhere between tor commit 9d922b8e-67fc69c8) tor added a new CONTROLLER_WAIT event type as advertised by...
GETINFO events/names
250-events/names=CIRC CIRC_MINOR STREAM ORCONN BW DEBUG INFO NOTICE WARN ERR NEWDESC ADDRMAP DESCCHANGED NS STATUS_GENERAL STATUS_CLIENT STATUS_SERVER GUARD STREAM_BW CLIENTS_SEEN NEWCONSENSUS BUILDTIMEOUT_SET SIGNAL CONF_CHANGED CONN_BW CELL_STATS CIRC_BW TRANSPORT_LAUNCHED HS_DESC HS_DESC_CONTENT NETWORK_LIVENESS CONTROLLER_WAIT
However, this event isn't in the control-spec.