Don't try to attach kanela instrumentaion when init

src/main/scala/Monitor.scala

@@ -29,7 +29,7 @@ final class Monitor(
     logger.info(s"lila-ws 3.0 netty kamon=$useKamon")
     logger.info(s"Java version: $version, memory: ${memory}MB")
 
-    if useKamon then kamon.Kamon.init()
+    if useKamon then kamon.Kamon.initWithoutAttaching()
 
     scheduler.scheduleWithFixedDelay(5.seconds, 1949.millis) { () => periodicMetrics() }