Revert back to original timer logic (but keep the changes to use timer per the docs)

network/health/tracker.go

@@ -123,21 +123,21 @@ func (t *Tracker) start(quitCh <-chan struct{}) {
 			break
 		case heartbeat = <-t.heartbeat:
 			jww.INFO.Printf("heartbeat: %v", heartbeat)
+			if healthy(heartbeat) {
 				// Stop and reset timer
 				if !timer.Stop() {
 					select {
-				case <-timer.C: // per docs explicitly drain
+					// per docs explicitly drain
+					case <-timer.C:
 					default:
 					}
 				}
 				timer.Reset(t.timeout)
-			if healthy(heartbeat) {
 				t.setHealth(true)
 			}
 			break
 		case <-timer.C:
 			t.setHealth(false)
-			timer.Reset(t.timeout)
 			break
 		}
 	}