Add tests to verify that every config setting for each auto-configured meter registry is exposed as a configuration property

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

@@ -36,8 +36,8 @@ public class DatadogProperties extends StepRegistryProperties {
 	private String apiKey;
 
 	/**
-	 * Datadog application key. Not strictly required, but improves the Datadog experience
-	 * by sending meter descriptions, types, and base units to Datadog.
+	 * Datadog's application key. Not strictly required, but improves the Datadog
+	 * experience by sending meter descriptions, types, and base units to Datadog.
 	 */
 	private String applicationKey;
 

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

@@ -0,0 +1,109 @@
+/*
+ * Copyright 2012-2023 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;
+
+import java.lang.reflect.Method;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.Assert;
+
+import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.PropertiesConfigAdapter;
+
+/**
+ * Utility to test that all Micrometer config values are exposed via properties and
+ * settable using the corresponding {@link PropertiesConfigAdapter} implementation.
+ *
+ * @author Mirko Sobeck
+ */
+public final class TestConfigsToPropertiesExposure {
+
+	private TestConfigsToPropertiesExposure() {
+
+	}
+
+	private static final List<Class<?>> classesForPropertiesList = List.of(Boolean.class, Byte.class, Character.class,
+			Short.class, Integer.class, Long.class, Double.class, Float.class, String.class, Duration.class);
+
+	/**
+	 * Assertion to test if default methods of a given config are overridden by the
+	 * adapter which implements it. This can be an indicator for micrometer config fields,
+	 * that have been forgotten to expose via spring properties. Not overridden default
+	 * methods in adapters are the most common cause of forgotten field exposure, because
+	 * they do not for force an override.
+	 * @param config micrometer config
+	 * @param adapter adapter for properties {@link PropertiesConfigAdapter}
+	 * @param excludedConfigMethods config methods that should be excluded for the
+	 * assertion
+	 */
+	public static void assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(Class<?> config,
+			Class<? extends PropertiesConfigAdapter<?>> adapter, String... excludedConfigMethods) {
+		List<String> configDefaultMethodNames = Arrays.stream(config.getDeclaredMethods())
+				.filter((method) -> method.isDefault() && isSettableUsingProperties(method.getReturnType()))
+				.map(Method::getName).collect(Collectors.toList());
+
+		configDefaultMethodNames.removeAll(Arrays.stream(excludedConfigMethods).toList());
+		List<String> notOverriddenDefaultMethods = new ArrayList<>(configDefaultMethodNames);
+
+		Class<?> currentClass = adapter;
+		// loop through adapter class and superclasses
+		// to find not overridden config methods
+		while (!Object.class.equals(currentClass)) {
+			List<String> overriddenClassDefaultMethods = Arrays.stream(currentClass.getDeclaredMethods())
+					.map(Method::getName).filter(configDefaultMethodNames::contains).toList();
+
+			notOverriddenDefaultMethods.removeAll(overriddenClassDefaultMethods);
+			currentClass = currentClass.getSuperclass();
+		}
+
+		if (notOverriddenDefaultMethods.size() >= 1) {
+			Assert.fail(
+					"Found config default methods that are not overridden by the related PropertiesConfigAdapter: \n"
+							+ notOverriddenDefaultMethods + "\n"
+							+ "This could be an indicator for not exposed properties fields.\n"
+							+ "Please check if the fields are meant to be exposed and if not, "
+							+ "exclude them from this test by providing them to the method.");
+		}
+	}
+
+	/**
+	 * Guess if a class can be set using properties. This will only catch the basic use
+	 * cases regarding the micrometer configs to filter out methods that are not likely to
+	 * be designed to be set via properties. <pre>
+	 *     isSettableUsingProperties(String.class) = true
+	 *     isSettableUsingProperties(boolean.class) = true
+	 *     isSettableUsingProperties(Object.class) = false
+	 * </pre>
+	 * @param clazz Class
+	 * @return is likely to be settable using properties
+	 */
+	private static boolean isSettableUsingProperties(Class<?> clazz) {
+		if (Void.TYPE.equals(clazz)) {
+			return false;
+		}
+
+		if (clazz.isPrimitive()) {
+			return true;
+		}
+
+		return classesForPropertiesList.contains(clazz);
+	}
+
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -16,8 +16,10 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.appoptics;
 
+import io.micrometer.appoptics.AppOpticsConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.StepRegistryPropertiesConfigAdapterTests;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -68,4 +70,10 @@ void whenPropertiesFloorTimesIsSetAdapterFloorTimesReturnsIt() {
 		assertThat(createConfigAdapter(properties).floorTimes()).isTrue();
 	}
 
+	@Test
+	void allDefaultConfigMethodsAreOverriddenByAtlasPropertiesConfigAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(AppOpticsConfig.class,
+				AppOpticsPropertiesConfigAdapter.class, "connectTimeout");
+	}
+
 }

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

@@ -18,8 +18,11 @@
 
 import java.time.Duration;
 
+import com.netflix.spectator.atlas.AtlasConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -116,4 +119,11 @@ void whenPropertiesEvalUriIsSetAdapterEvalUriReturnsIt() {
 				.isEqualTo("https://atlas.example.com/evaluate");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(AtlasConfig.class,
+				AtlasPropertiesConfigAdapter.class, "lwcIgnorePublishStep", "initialPollingDelay", "autoStart",
+				"lwcStep", "validTagCharacters");
+	}
+
 }

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

@@ -16,8 +16,10 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.datadog;
 
+import io.micrometer.datadog.DatadogConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.StepRegistryPropertiesConfigAdapterTests;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -76,4 +78,10 @@ void whenPropertiesUriIsSetAdapterUriReturnsIt() {
 		assertThat(createConfigAdapter(properties).uri()).isEqualTo("https://app.example.com/api/v1/series");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(DatadogConfig.class,
+				DatadogPropertiesConfigAdapter.class);
+	}
+
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -19,8 +19,11 @@
 import java.util.HashMap;
 
 import io.micrometer.dynatrace.DynatraceApiVersion;
+import io.micrometer.dynatrace.DynatraceConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -125,4 +128,10 @@ void defaultValues() {
 		assertThat(properties.getV2().isUseDynatraceSummaryInstruments()).isTrue();
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(DynatraceConfig.class,
+				DynatracePropertiesConfigAdapter.class, "documentType");
+	}
+
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -16,8 +16,11 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.elastic;
 
+import io.micrometer.elastic.ElasticConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -97,4 +100,10 @@ void whenPropertiesApiKeyCredentialsIsSetAdapterPipelineReturnsIt() {
 		assertThat(new ElasticPropertiesConfigAdapter(properties).apiKeyCredentials()).isEqualTo("secret");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(ElasticConfig.class,
+				ElasticPropertiesConfigAdapter.class, "documentType");
+	}
+
 }

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

@@ -20,8 +20,11 @@
 import java.util.concurrent.TimeUnit;
 
 import info.ganglia.gmetric4j.gmetric.GMetric.UDPAddressingMode;
+import io.micrometer.ganglia.GangliaConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -81,4 +84,10 @@ void whenPropertiesPortIsSetAdapterPortReturnsIt() {
 		assertThat(new GangliaPropertiesConfigAdapter(properties).port()).isEqualTo(4242);
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(GangliaConfig.class,
+				GangliaPropertiesConfigAdapter.class, "protocolVersion");
+	}
+
 }

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

@@ -19,9 +19,12 @@
 import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 
+import io.micrometer.graphite.GraphiteConfig;
 import io.micrometer.graphite.GraphiteProtocol;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -94,4 +97,10 @@ void whenPropertiesTagsAsPrefixIsSetAdapterTagsAsPrefixReturnsIt() {
 		assertThat(new GraphitePropertiesConfigAdapter(properties).tagsAsPrefix()).isEqualTo(new String[] { "worker" });
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(GraphiteConfig.class,
+				GraphitePropertiesConfigAdapter.class);
+	}
+
 }

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

@@ -18,8 +18,11 @@
 
 import java.util.Collections;
 
+import io.micrometer.humio.HumioConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -51,4 +54,10 @@ void whenPropertiesUriIsSetAdapterUriReturnsIt() {
 		assertThat(new HumioPropertiesConfigAdapter(properties).uri()).isEqualTo("https://humio.example.com");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(HumioConfig.class,
+				HumioPropertiesConfigAdapter.class, "connectTimeout");
+	}
+
 }

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

@@ -17,8 +17,11 @@
 package org.springframework.boot.actuate.autoconfigure.metrics.export.influx;
 
 import io.micrometer.influx.InfluxApiVersion;
+import io.micrometer.influx.InfluxConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -58,4 +61,10 @@ void adaptInfluxV2BasicConfig() {
 		assertThat(adapter.token()).isEqualTo("token");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(InfluxConfig.class,
+				InfluxPropertiesConfigAdapter.class);
+	}
+
 }

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

@@ -18,8 +18,11 @@
 
 import java.time.Duration;
 
+import io.micrometer.jmx.JmxConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -43,4 +46,10 @@ void whenPropertiesDomainIsSetAdapterDomainReturnsIt() {
 		assertThat(new JmxPropertiesConfigAdapter(properties).domain()).isEqualTo("abc");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(JmxConfig.class,
+				JmxPropertiesConfigAdapter.class);
+	}
+
 }

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

@@ -16,8 +16,10 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.kairos;
 
+import io.micrometer.kairos.KairosConfig;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.actuate.autoconfigure.metrics.export.TestConfigsToPropertiesExposure;
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.StepRegistryPropertiesConfigAdapterTests;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -62,4 +64,10 @@ void whenPropertiesPasswordIsSetAdapterPasswordReturnsIt() {
 		assertThat(createConfigAdapter(properties).password()).isEqualTo("secret");
 	}
 
+	@Test
+	void allConfigDefaultMethodsAreOverriddenByAdapter() {
+		TestConfigsToPropertiesExposure.assertThatAllConfigDefaultMethodsAreOverriddenByAdapter(KairosConfig.class,
+				KairosPropertiesConfigAdapter.class);
+	}
+
 }