discovery stale records dropout implemented

api/pkg/discovery/announcer.go

@@ -117,9 +117,18 @@ func (a *Announcer) sendAnnouncement() {
 }
 
 func (a *Announcer) sendHeartbeat() {
+	entryKey := registryKey(
+		a.announce.Service,
+		a.announce.Rail,
+		legacyNetworkFromCurrencies(a.announce.Currencies),
+		a.announce.Operations,
+		a.announce.Version,
+		a.announce.InstanceID,
+	)
 	hb := Heartbeat{
 		ID:         a.announce.ID,
 		InstanceID: a.announce.InstanceID,
+		EntryKey:   entryKey,
 		Status:     "ok",
 		TS:         time.Now().Unix(),
 	}