Merge branch 'master' into pekko_1.1

Author: hughsimpson

instrumentation/kamon-pekko/src/main/scala/kamon/instrumentation/pekko/instrumentations/DispatcherInstrumentation.scala

@@ -128,15 +128,18 @@ object InstrumentNewExecutorServiceOnPekko {
     @SuperCall callable: Callable[ExecutorService]
   ): ExecutorService = {
     val executor = callable.call()
-    if (factory.dispatcherPrerequisites == null)
-      println(s"Failed to find dispatcherPrerequisites on ${factory.getClass}:: $factory")
-    val actorSystemName = Option(factory.dispatcherPrerequisites).map(_.settings.name).getOrElse("--unknown actor--")
+    val actorSystemName = if (factory.dispatcherPrerequisites != null) {
+      factory.dispatcherPrerequisites.settings.name
+    } else {
+      "unknown"
+    }
     val dispatcherName = factory.dispatcherName
     val scheduledActionName = actorSystemName + "/" + dispatcherName
     val systemTags = TagSet.of("pekko.system", actorSystemName)
 
     if (Kamon.filter(PekkoInstrumentation.TrackDispatcherFilterName).accept(dispatcherName)) {
-      val defaultEcOption = Option(factory.dispatcherPrerequisites).flatMap(_.defaultExecutionContext)
+      val defaultEcOption = Option(factory.dispatcherPrerequisites)
+        .flatMap(_.defaultExecutionContext)
 
       if (dispatcherName == Dispatchers.DefaultDispatcherId && defaultEcOption.isDefined) {
         ExecutorInstrumentation.instrumentExecutionContext(