A machine whose node-engine is heard and whose runtime is gone is a
machine nobody can ask anything, and nothing said so. The runtime now
says on mesh.control.<node>.tools-alive, every minute, that it is there,
with its interval and build; the controller raises tools-silent after
three missed. Core NATS, like the host's heartbeat: a lost one is the
next one. A heartbeat the bus refuses is logged when that starts and
when it stops.
jochen
0307df0850