keepalive channels per backend?
Note source in channel value struct
udp backends may ignore MTU
make event collectors threadsafe to stop marshalling data...
collect & check backend API version
move all connection establishment to _start to be able to hot-stop/start all backends
event deduplication in core?
move all typenames to _t

per-channel filters
	* invert
	* edge detection

channel discovery / enumeration
note exit condition/reconnection details for backends