remove Signal.toString

Author: JonasKunz

exporters/common/src/main/java/io/opentelemetry/exporter/internal/grpc/GrpcExporter.java

@@ -48,7 +48,7 @@ public GrpcExporter(
       StandardComponentId componentId,
       Supplier<MeterProvider> meterProviderSupplier,
       String endpoint) {
-    this.type = componentId.getStandardType().signal().toString();
+    this.type = componentId.getStandardType().signal().logFriendlyName();
     this.grpcSender = grpcSender;
     this.exporterMetrics =
         new ExporterInstrumentation(

exporters/common/src/main/java/io/opentelemetry/exporter/internal/http/HttpExporter.java

@@ -45,7 +45,7 @@ public HttpExporter(
       Supplier<MeterProvider> meterProviderSupplier,
       InternalTelemetryVersion internalTelemetryVersion,
       String endpoint) {
-    this.type = componentId.getStandardType().signal().toString();
+    this.type = componentId.getStandardType().signal().logFriendlyName();
     this.httpSender = httpSender;
     this.exporterMetrics =
         new ExporterInstrumentation(

sdk/common/src/main/java/io/opentelemetry/sdk/internal/Signal.java

@@ -25,8 +25,7 @@ public enum Signal {
     this.metricUnit = metricUnit;
   }
 
-  @Override
-  public String toString() {
+  public String logFriendlyName() {
     return name().toLowerCase(Locale.ENGLISH);
   }