Add experimental ConditionalResourceProvider interface

sdk-extensions/autoconfigure-spi/src/main/java/io/opentelemetry/sdk/autoconfigure/spi/internal/ConditionalResourceProvider.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.autoconfigure.spi.internal;
+
+import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
+import io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider;
+import io.opentelemetry.sdk.resources.Resource;
+
+/**
+ * A resource provider that is only applied if the {@link #shouldApply(ConfigProperties, Resource)}
+ * method returns {@code true}.
+ *
+ * <p>This class is internal and is hence not for public use. Its APIs are unstable and can change
+ * at any time.
+ */
+public interface ConditionalResourceProvider extends ResourceProvider {
+
+  /**
+   * If an implementation needs to apply only under certain conditions related to the config or the
+   * existing state of the Resource being built, they can choose to override this default.
+   *
+   * @param config The auto configuration properties
+   * @param existing The current state of the Resource being created
+   * @return false to skip over this ResourceProvider, or true to use it
+   */
+  boolean shouldApply(ConfigProperties config, Resource existing);
+}

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/ResourceConfiguration.java

@@ -9,6 +9,7 @@
 import io.opentelemetry.api.common.AttributesBuilder;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
 import io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider;
+import io.opentelemetry.sdk.autoconfigure.spi.internal.ConditionalResourceProvider;
 import io.opentelemetry.sdk.resources.Resource;
 import io.opentelemetry.sdk.resources.ResourceBuilder;
 import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;
@@ -46,6 +47,10 @@ static Resource configureResource(
       if (disabledProviders.contains(resourceProvider.getClass().getName())) {
         continue;
       }
+      if (resourceProvider instanceof ConditionalResourceProvider
+          && !((ConditionalResourceProvider) resourceProvider).shouldApply(config, result)) {
+        continue;
+      }
       result = result.merge(resourceProvider.createResource(config));
     }