Polish "Update validation of Micrometer configuration"

See gh-21067

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/ValidationFailureAnalyzer.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -16,31 +16,29 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
+import io.micrometer.core.instrument.config.validate.Validated.Invalid;
 import io.micrometer.core.instrument.config.validate.ValidationException;
+
 import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
 import org.springframework.boot.diagnostics.FailureAnalysis;
 
-import java.util.stream.Collectors;
-
 /**
  * An {@link AbstractFailureAnalyzer} that performs analysis of failures caused by a
  * {@link ValidationException}.
  *
  * @author Andy Wilkinson
  */
-class ValidationFailureAnalyzer
-		extends AbstractFailureAnalyzer<ValidationException> {
+class ValidationFailureAnalyzer extends AbstractFailureAnalyzer<ValidationException> {
 
 	@Override
 	protected FailureAnalysis analyze(Throwable rootFailure, ValidationException cause) {
-		String description = cause.getValidation().failures().stream()
-				.map(failure -> "management.metrics.export." + failure.getProperty() + " was '" +
-						(failure.getValue() == null ? "null" : failure.getValue().toString()) +
-						"' but it " + failure.getMessage() + ".")
-				.collect(Collectors.joining("\n"));
-
-		return new FailureAnalysis(description,
-				"Update your application to provide the missing configuration.", cause);
+		StringBuilder description = new StringBuilder(String.format("Invalid Micrometer configuration detected:%n"));
+		for (Invalid<?> failure : cause.getValidation().failures()) {
+			description.append(String.format("%n  - management.metrics.export.%s was '%s' but it %s",
+					failure.getProperty(), failure.getValue(), failure.getMessage()));
+		}
+		return new FailureAnalysis(description.toString(),
+				"Update your application to correct the invalid configuration.", cause);
 	}
 
 }

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -22,6 +22,7 @@ import java.util.concurrent.TimeUnit;
 import info.ganglia.gmetric4j.gmetric.GMetric;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
 
 /**
  * {@link ConfigurationProperties @ConfigurationProperties} for configuring Ganglia
@@ -46,10 +47,7 @@ public class GangliaProperties {
 
 	/**
 	 * Base time unit used to report rates.
-	 *
-	 * @deprecated No longer used by Micrometer.
 	 */
-	@Deprecated
 	private TimeUnit rateUnits;
 
 	/**
@@ -59,10 +57,7 @@ public class GangliaProperties {
 
 	/**
 	 * Ganglia protocol version. Must be either 3.1 or 3.0.
-	 *
-	 * @deprecated No longer used by Micrometer.
 	 */
-	@Deprecated
 	private String protocolVersion;
 
 	/**
@@ -102,10 +97,13 @@ public class GangliaProperties {
 		this.step = step;
 	}
 
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer used by Micormeter")
 	public TimeUnit getRateUnits() {
 		return this.rateUnits;
 	}
 
+	@Deprecated
 	public void setRateUnits(TimeUnit rateUnits) {
 		this.rateUnits = rateUnits;
 	}
@@ -118,10 +116,13 @@ public class GangliaProperties {
 		this.durationUnits = durationUnits;
 	}
 
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "No longer used by Micormeter")
 	public String getProtocolVersion() {
 		return this.protocolVersion;
 	}
 
+	@Deprecated
 	public void setProtocolVersion(String protocolVersion) {
 		this.protocolVersion = protocolVersion;
 	}

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

@@ -36,11 +36,6 @@ public abstract class PushRegistryPropertiesConfigAdapter<T extends PushRegistry
 		super(properties);
 	}
 
-	@Override
-	public String prefix() {
-		return null;
-	}
-
 	@Override
 	public String get(String k) {
 		return null;

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -39,12 +39,11 @@ class ValidationFailureAnalyzerTests {
 	@Test
 	void analyzesMissingRequiredConfiguration() {
 		FailureAnalysis analysis = new ValidationFailureAnalyzer()
-				.analyze(createFailure(MissingAccountIdConfiguration.class));
+				.analyze(createFailure(MissingAccountIdAndApiKeyConfiguration.class));
 		assertThat(analysis).isNotNull();
-		assertThat(analysis.getDescription()).isEqualTo(
-				"management.metrics.export.newrelic.apiKey was 'null' but it is required when publishing to Insights API.\n" +
-				"management.metrics.export.newrelic.accountId was 'null' but it is required when publishing to Insights API.");
-		assertThat(analysis.getAction()).isEqualTo("Update your application to provide the missing configuration.");
+		assertThat(analysis.getDescription()).isEqualTo(String.format("Invalid Micrometer configuration detected:%n%n"
+				+ "  - management.metrics.export.newrelic.apiKey was 'null' but it is required when publishing to Insights API%n"
+				+ "  - management.metrics.export.newrelic.accountId was 'null' but it is required when publishing to Insights API"));
 	}
 
 	private Exception createFailure(Class<?> configuration) {
@@ -58,7 +57,7 @@ class ValidationFailureAnalyzerTests {
 	}
 
 	@Configuration(proxyBeanMethods = false)
-	static class MissingAccountIdConfiguration {
+	static class MissingAccountIdAndApiKeyConfiguration {
 
 		@Bean
 		NewRelicMeterRegistry meterRegistry() {

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -29,6 +29,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class GangliaPropertiesTests {
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void defaultValuesAreConsistent() {
 		GangliaProperties properties = new GangliaProperties();
 		GangliaConfig config = GangliaConfig.DEFAULT;

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

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -16,14 +16,12 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics.export.wavefront;
 
-import io.micrometer.core.instrument.config.validate.ValidationException;
 import io.micrometer.wavefront.WavefrontConfig;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.actuate.autoconfigure.metrics.export.properties.PushRegistryPropertiesTests;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /**
  * Tests for {@link WavefrontProperties}.