The controller raises what the watchman says stopped moving, and takes a machine's silence from its presence (issue 1156)

cmd/mesh-controller/signals.go

@@ -335,7 +335,7 @@ func watchHeartbeats(f *signalFacts) []conditions.Observation {
 		}
 		bound := heartbeatBound(m.every)
 		silent := f.now.Sub(m.lastHeard)
-		if silent <= bound {
+		if !m.silent(f.now) {
 			continue
 		}
 		severity := conditions.Warning
@@ -357,7 +357,7 @@ func watchReports(f *signalFacts) []conditions.Observation {
 		if m.sentAt.IsZero() || m.reportedCurrent || m.asleep() {
 			continue
 		}
-		if !m.lastHeard.IsZero() && f.now.Sub(m.lastHeard) > heartbeatBound(m.every) {
+		if m.silent(f.now) {
 			continue // silent: S1 says it, and a silent machine reports nothing
 		}
 		bound := max(reportAtLeast, 3*m.lastApply)