fix: increase staleThreshold to 10s

internal/discovery/types.go

@@ -57,7 +57,7 @@ func NewNodeDiscovery(udpPort string) *NodeDiscovery {
 	return &NodeDiscovery{
 		udpPort:         udpPort,
 		discoveredNodes: make(map[string]*NodeInfo),
-		staleThreshold:  8 * time.Second, // 8 seconds to accommodate 5-second heartbeat interval
+		staleThreshold:  10 * time.Second, // TODO make configurable
 		logger:          log.New(),
 	}
 }