refactor: remove ThreadGrouper as well, since it is now unused

See: [#14047](#14047)

Author: jhayes2-chwy

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/HandlerRegistry.java

@@ -10,7 +10,6 @@
 import io.opentelemetry.api.metrics.MeterBuilder;
 import io.opentelemetry.instrumentation.api.internal.EmbeddedInstrumentationProperties;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.buffer.DirectBufferStatisticsHandler;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.classes.ClassesLoadedHandler;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.container.ContainerConfigurationHandler;
@@ -84,17 +83,16 @@ static List<RecordedEventHandler> getHandlers(
       }
     }
 
-    ThreadGrouper grouper = new ThreadGrouper();
     List<RecordedEventHandler> basicHandlers =
         List.of(
-            new ObjectAllocationInNewTlabHandler(meter, grouper),
-            new ObjectAllocationOutsideTlabHandler(meter, grouper),
-            new NetworkReadHandler(meter, grouper),
-            new NetworkWriteHandler(meter, grouper),
+            new ObjectAllocationInNewTlabHandler(meter),
+            new ObjectAllocationOutsideTlabHandler(meter),
+            new NetworkReadHandler(meter),
+            new NetworkWriteHandler(meter),
             new ContextSwitchRateHandler(meter),
             new OverallCpuLoadHandler(meter),
             new ContainerConfigurationHandler(meter),
-            new LongLockHandler(meter, grouper),
+            new LongLockHandler(meter),
             new ThreadCountHandler(meter),
             new ClassesLoadedHandler(meter),
             new MetaspaceSummaryHandler(meter),

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/internal/ThreadGrouper.java

@@ -12,7 +12,6 @@
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.Constants;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.DurationUtil;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import java.time.Duration;
 import java.util.Optional;
 import jdk.jfr.consumer.RecordedEvent;
@@ -31,7 +30,7 @@ public final class LongLockHandler implements RecordedEventHandler {
   private final DoubleHistogram histogram;
   private final Attributes attributes;
 
-  public LongLockHandler(Meter meter, ThreadGrouper grouper) {
+  public LongLockHandler(Meter meter) {
     super();
     histogram =
         meter

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/internal/cpu/LongLockHandler.java

@@ -11,7 +11,6 @@
 import io.opentelemetry.instrumentation.runtimemetrics.java17.JfrFeature;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.Constants;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import jdk.jfr.consumer.RecordedEvent;
 
 /**
@@ -28,7 +27,7 @@ public final class ObjectAllocationInNewTlabHandler implements RecordedEventHand
   private final LongHistogram histogram;
   private final Attributes attributes;
 
-  public ObjectAllocationInNewTlabHandler(Meter meter, ThreadGrouper grouper) {
+  public ObjectAllocationInNewTlabHandler(Meter meter) {
     super();
     histogram =
         meter

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/internal/memory/ObjectAllocationInNewTlabHandler.java

@@ -11,7 +11,6 @@
 import io.opentelemetry.instrumentation.runtimemetrics.java17.JfrFeature;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.Constants;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import jdk.jfr.consumer.RecordedEvent;
 
 /**
@@ -28,7 +27,7 @@ public final class ObjectAllocationOutsideTlabHandler implements RecordedEventHa
   private final LongHistogram histogram;
   private final Attributes attributes;
 
-  public ObjectAllocationOutsideTlabHandler(Meter meter, ThreadGrouper grouper) {
+  public ObjectAllocationOutsideTlabHandler(Meter meter) {
     super();
     histogram =
         meter

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/internal/memory/ObjectAllocationOutsideTlabHandler.java

@@ -13,7 +13,6 @@
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.Constants;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.DurationUtil;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import jdk.jfr.consumer.RecordedEvent;
 
 /**
@@ -28,7 +27,7 @@ public final class NetworkReadHandler implements RecordedEventHandler {
   private final DoubleHistogram durationHistogram;
   private final Attributes attributes;
 
-  public NetworkReadHandler(Meter meter, ThreadGrouper nameNormalizer) {
+  public NetworkReadHandler(Meter meter) {
     super();
     bytesHistogram =
         meter

instrumentation/runtime-telemetry/runtime-telemetry-java17/library/src/main/java/io/opentelemetry/instrumentation/runtimemetrics/java17/internal/network/NetworkReadHandler.java

@@ -13,7 +13,6 @@
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.Constants;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.DurationUtil;
 import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.RecordedEventHandler;
-import io.opentelemetry.instrumentation.runtimemetrics.java17.internal.ThreadGrouper;
 import jdk.jfr.consumer.RecordedEvent;
 
 // jdk.SocketWrite {
@@ -46,7 +45,7 @@ public final class NetworkWriteHandler implements RecordedEventHandler {
   private final DoubleHistogram durationHistogram;
   private final Attributes attributes;
 
-  public NetworkWriteHandler(Meter meter, ThreadGrouper nameNormalizer) {
+  public NetworkWriteHandler(Meter meter) {
     super();
     bytesHistogram =
         meter