Add resourceAttributes property to OtlpProperties

See gh-30984

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/otlp/OtlpProperties.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.otlp;
 
+import java.util.Map;
+
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.StepRegistryProperties;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
@@ -34,6 +36,11 @@ public class OtlpProperties extends StepRegistryProperties {
 	 */
 	private String url = "http://localhost:4318/v1/metrics";
 
+	/**
+	 * Monitored resource's attributes.
+	 */
+	private Map<String, String> resourceAttributes;
+
 	public String getUrl() {
 		return this.url;
 	}
@@ -42,4 +49,12 @@ public class OtlpProperties extends StepRegistryProperties {
 		this.url = url;
 	}
 
+	public Map<String, String> getResourceAttributes() {
+		return this.resourceAttributes;
+	}
+
+	public void setResourceAttributes(Map<String, String> resourceAttributes) {
+		this.resourceAttributes = resourceAttributes;
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/otlp/OtlpPropertiesConfigAdapter.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.otlp;
 
+import java.util.Map;
+
 import io.micrometer.registry.otlp.OtlpConfig;
 
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.StepRegistryPropertiesConfigAdapter;
@@ -41,4 +43,9 @@ class OtlpPropertiesConfigAdapter extends StepRegistryPropertiesConfigAdapter<Ot
 		return get(OtlpProperties::getUrl, OtlpConfig.super::url);
 	}
 
+	@Override
+	public Map<String, String> resourceAttributes() {
+		return get(OtlpProperties::getResourceAttributes, OtlpConfig.super::resourceAttributes);
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/otlp/OtlpPropertiesConfigAdapterTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.metrics.export.otlp;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link OtlpPropertiesConfigAdapter}.
+ *
+ * @author Eddú Meléndez
+ */
+class OtlpPropertiesConfigAdapterTest {
+
+	@Test
+	void whenPropertiesUrlIsSetAdapterProjectIdReturnsIt() {
+		OtlpProperties properties = new OtlpProperties();
+		properties.setUrl("http://another-url:4318/v1/metrics");
+		assertThat(new OtlpPropertiesConfigAdapter(properties).url()).isEqualTo("http://another-url:4318/v1/metrics");
+	}
+
+	@Test
+	void whenPropertiesResourceTypeIsSetAdapterResourceTypeReturnsIt() {
+		OtlpProperties properties = new OtlpProperties();
+		properties.setResourceAttributes(Map.of("service.name", "boot-service"));
+		assertThat(new OtlpPropertiesConfigAdapter(properties).resourceAttributes()).containsEntry("service.name",
+				"boot-service");
+	}
+
+}