Delete old ResourceProvider class (#2895)

sdk/common/src/main/java/io/opentelemetry/sdk/resources/Resource.java

@@ -25,11 +25,6 @@ import javax.annotation.concurrent.Immutable;
 /**
  * {@link Resource} represents a resource, which capture identifying information about the entities
  * for which signals (stats or traces) are reported.
- *
- * <p>To disable any {@link ResourceProvider} found on the classpath from being recognized, set the
- * fully qualified class names of the {@link ResourceProvider} implementations as a comma separated
- * list to the system property {@code -Dotel.java.disabled.resource_providers} or the {@code
- * OTEL_JAVA_DISABLED_RESOURCE_PROVIDERS} environment variable.
  */
 @Immutable
 @AutoValue

sdk/common/src/main/java/io/opentelemetry/sdk/resources/ResourceProvider.java

@@ -1,27 +0,0 @@
-/*
- * Copyright The OpenTelemetry Authors
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package io.opentelemetry.sdk.resources;
-
-import io.opentelemetry.api.common.Attributes;
-
-/**
- * ResourceProvider is a service provider for additional {@link Resource}s. Users of OpenTelemetry
- * SDK can use it to add custom {@link Resource} attributes.
- *
- * <p>Fully qualified class name of the implementation should be registered in {@code
- * META-INF/services/io.opentelemetry.sdk.resources.ResourceProvider}.
- *
- * <p>Resources specified via system properties or environment variables will take precedence over
- * any value supplied via {@code ResourceProvider}.
- */
-public abstract class ResourceProvider {
-
-  public Resource create() {
-    return Resource.create(getAttributes());
-  }
-
-  protected abstract Attributes getAttributes();
-}