Polish "Align with Micrometer's standardized cache metrics"

Closes gh-11918

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

@@ -18,7 +18,6 @@ package org.springframework.boot.actuate.autoconfigure.metrics.cache;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cache.Cache;
 import org.springframework.cache.CacheManager;
 import org.springframework.context.annotation.Configuration;
@@ -33,7 +32,6 @@ import org.springframework.context.annotation.Import;
 @Configuration
 @ConditionalOnBean(CacheManager.class)
 @ConditionalOnProperty(value = "management.metrics.cache.instrument", matchIfMissing = true)
-@EnableConfigurationProperties(CacheMetricsProperties.class)
 @Import({ CacheMeterBinderProvidersConfiguration.class,
 		CacheMetricsRegistrarConfiguration.class })
 public class CacheMetricsConfiguration {

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

@@ -1,43 +0,0 @@
-/*
- * Copyright 2012-2018 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
- *
- *      http://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.cache;
-
-import org.springframework.boot.context.properties.ConfigurationProperties;
-
-/**
- * Configuration properties for Cache-based metrics.
- *
- * @author Stephane Nicoll
- * @since 2.0.0
- */
-@ConfigurationProperties("management.metrics.cache")
-public class CacheMetricsProperties {
-
-	/**
-	 * Name of the metric for cache usage.
-	 */
-	private String metricName = "cache";
-
-	public String getMetricName() {
-		return this.metricName;
-	}
-
-	public void setMetricName(String metricName) {
-		this.metricName = metricName;
-	}
-
-}

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

@@ -49,24 +49,19 @@ class CacheMetricsRegistrarConfiguration {
 
 	private final Collection<CacheMeterBinderProvider<?>> binderProviders;
 
-	private final CacheMetricsProperties properties;
-
 	private final Map<String, CacheManager> cacheManagers;
 
 	CacheMetricsRegistrarConfiguration(MeterRegistry registry,
-			CacheMetricsProperties properties,
 			Collection<CacheMeterBinderProvider<?>> binderProviders,
 			Map<String, CacheManager> cacheManagers) {
 		this.registry = registry;
-		this.properties = properties;
 		this.binderProviders = binderProviders;
 		this.cacheManagers = cacheManagers;
 	}
 
 	@Bean
 	public CacheMetricsRegistrar cacheMetricsRegistrar() {
-		return new CacheMetricsRegistrar(this.registry, this.properties.getMetricName(),
+		return new CacheMetricsRegistrar(this.registry, this.binderProviders);
-				this.binderProviders);
 	}
 
 	@PostConstruct

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

@@ -44,21 +44,9 @@ public class CacheMetricsConfigurationTests {
 		this.contextRunner.withPropertyValues("spring.cache.type=caffeine",
 				"spring.cache.cache-names=cache1,cache2").run((context) -> {
 					MeterRegistry registry = context.getBean(MeterRegistry.class);
-					registry.get("cache.requests").tags("name", "cache1")
+					registry.get("cache.gets").tags("name", "cache1")
 							.tags("cacheManager", "cacheManager").meter();
-					registry.get("cache.requests").tags("name", "cache2")
+					registry.get("cache.gets").tags("name", "cache2")
-							.tags("cacheManager", "cacheManager").meter();
-				});
-	}
-
-	@Test
-	public void autoConfiguredCacheManagerWithCustomMetricName() {
-		this.contextRunner
-				.withPropertyValues("management.metrics.cache.metric-name=custom.name",
-						"spring.cache.type=caffeine", "spring.cache.cache-names=cache1")
-				.run((context) -> {
-					MeterRegistry registry = context.getBean(MeterRegistry.class);
-					registry.get("custom.name.requests").tags("name", "cache1")
 							.tags("cacheManager", "cacheManager").meter();
 				});
 	}
@@ -68,9 +56,9 @@ public class CacheMetricsConfigurationTests {
 		this.contextRunner.withPropertyValues("spring.cache.type=simple",
 				"spring.cache.cache-names=cache1,cache2").run((context) -> {
 					MeterRegistry registry = context.getBean(MeterRegistry.class);
-					assertThat(registry.find("cache.requests").tags("name", "cache1")
+					assertThat(registry.find("cache.gets").tags("name", "cache1")
 							.tags("cacheManager", "cacheManager").meter()).isNull();
-					assertThat(registry.find("cache.requests").tags("name", "cache2")
+					assertThat(registry.find("cache.gets").tags("name", "cache2")
 							.tags("cacheManager", "cacheManager").meter()).isNull();
 				});
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/CacheMeterBinderProvider.java

@@ -35,10 +35,9 @@ public interface CacheMeterBinderProvider<C extends Cache> {
 	 * Return the {@link MeterBinder} managing the specified {@link Cache} or {@code null}
 	 * if the specified {@link Cache} is not supported.
 	 * @param cache the cache to instrument
-	 * @param name the name prefix of the metrics
 	 * @param tags tags to apply to all recorded metrics
 	 * @return a {@link MeterBinder} handling the specified {@link Cache} or {@code null}
 	 */
-	MeterBinder getMeterBinder(C cache, String name, Iterable<Tag> tags);
+	MeterBinder getMeterBinder(C cache, Iterable<Tag> tags);
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/CacheMetricsRegistrar.java

@@ -37,21 +37,17 @@ public class CacheMetricsRegistrar {
 
 	private final MeterRegistry registry;
 
-	private final String metricName;
-
 	private final Collection<CacheMeterBinderProvider<?>> binderProviders;
 
 	/**
 	 * Creates a new registrar.
 	 * @param registry the {@link MeterRegistry} to use
-	 * @param metricName the name of the metric
 	 * @param binderProviders the {@link CacheMeterBinderProvider} instances that should
 	 * be used to detect compatible caches
 	 */
-	public CacheMetricsRegistrar(MeterRegistry registry, String metricName,
+	public CacheMetricsRegistrar(MeterRegistry registry,
 			Collection<CacheMeterBinderProvider<?>> binderProviders) {
 		this.registry = registry;
-		this.metricName = metricName;
 		this.binderProviders = binderProviders;
 	}
 
@@ -78,7 +74,7 @@ public class CacheMetricsRegistrar {
 				.callbacks(CacheMeterBinderProvider.class, this.binderProviders, cache)
 				.withLogger(CacheMetricsRegistrar.class)
 				.invokeAnd((binderProvider) -> binderProvider.getMeterBinder(cache,
-						this.metricName, cacheTags))
+						cacheTags))
 				.filter(Objects::nonNull).findFirst().orElse(null);
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/CaffeineCacheMeterBinderProvider.java

@@ -32,9 +32,8 @@ public class CaffeineCacheMeterBinderProvider
 		implements CacheMeterBinderProvider<CaffeineCache> {
 
 	@Override
-	public MeterBinder getMeterBinder(CaffeineCache cache, String name,
+	public MeterBinder getMeterBinder(CaffeineCache cache, Iterable<Tag> tags) {
-			Iterable<Tag> tags) {
+		return new CaffeineCacheMetrics(cache.getNativeCache(), cache.getName(), tags);
-		return new CaffeineCacheMetrics(cache.getNativeCache(), name, tags);
 	}
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/EhCache2CacheMeterBinderProvider.java

@@ -32,8 +32,7 @@ public class EhCache2CacheMeterBinderProvider
 		implements CacheMeterBinderProvider<EhCacheCache> {
 
 	@Override
-	public MeterBinder getMeterBinder(EhCacheCache cache, String name,
+	public MeterBinder getMeterBinder(EhCacheCache cache, Iterable<Tag> tags) {
-			Iterable<Tag> tags) {
 		return new EhCache2Metrics(cache.getNativeCache(), tags);
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/HazelcastCacheMeterBinderProvider.java

@@ -33,8 +33,7 @@ public class HazelcastCacheMeterBinderProvider
 
 	@Override
 	@SuppressWarnings("unchecked")
-	public MeterBinder getMeterBinder(HazelcastCache cache, String name,
+	public MeterBinder getMeterBinder(HazelcastCache cache, Iterable<Tag> tags) {
-			Iterable<Tag> tags) {
 		return new HazelcastCacheMetrics((IMap<Object, Object>) cache.getNativeCache(),
 				tags);
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/cache/JCacheCacheMeterBinderProvider.java

@@ -32,8 +32,7 @@ public class JCacheCacheMeterBinderProvider
 		implements CacheMeterBinderProvider<JCacheCache> {
 
 	@Override
-	public MeterBinder getMeterBinder(JCacheCache cache, String name,
+	public MeterBinder getMeterBinder(JCacheCache cache, Iterable<Tag> tags) {
-			Iterable<Tag> tags) {
 		return new JCacheMetrics(cache.getNativeCache(), tags);
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/cache/CacheMetricsRegistrarTests.java

@@ -39,7 +39,7 @@ public class CacheMetricsRegistrarTests {
 	@Test
 	public void bindToSupportedCache() {
 		CacheMetricsRegistrar registrar = new CacheMetricsRegistrar(this.meterRegistry,
-				"root", Collections.singleton(new CaffeineCacheMeterBinderProvider()));
+				Collections.singleton(new CaffeineCacheMeterBinderProvider()));
 		assertThat(registrar.bindCacheToRegistry(
 				new CaffeineCache("test", Caffeine.newBuilder().build()))).isTrue();
 		assertThat(this.meterRegistry.get("cache.gets").tags("name", "test").meter())
@@ -49,7 +49,7 @@ public class CacheMetricsRegistrarTests {
 	@Test
 	public void bindToUnsupportedCache() {
 		CacheMetricsRegistrar registrar = new CacheMetricsRegistrar(this.meterRegistry,
-				"root", Collections.emptyList());
+				Collections.emptyList());
 		assertThat(registrar.bindCacheToRegistry(
 				new CaffeineCache("test", Caffeine.newBuilder().build()))).isFalse();
 		assertThat(this.meterRegistry.find("cache.gets").tags("name", "test").meter())

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/cache/CaffeineCacheMeterBinderProviderTests.java

@@ -38,7 +38,7 @@ public class CaffeineCacheMeterBinderProviderTests {
 	public void caffeineCacheProvider() {
 		CaffeineCache cache = new CaffeineCache("test", Caffeine.newBuilder().build());
 		MeterBinder meterBinder = new CaffeineCacheMeterBinderProvider()
-				.getMeterBinder(cache, "test", Collections.emptyList());
+				.getMeterBinder(cache, Collections.emptyList());
 		assertThat(meterBinder).isInstanceOf(CaffeineCacheMetrics.class);
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/cache/EhCache2CacheMeterBinderProviderTests.java

@@ -47,7 +47,7 @@ public class EhCache2CacheMeterBinderProviderTests {
 			cacheManager.addCache(nativeCache);
 			EhCacheCache cache = new EhCacheCache(nativeCache);
 			MeterBinder meterBinder = new EhCache2CacheMeterBinderProvider()
-					.getMeterBinder(cache, "test", Collections.emptyList());
+					.getMeterBinder(cache, Collections.emptyList());
 			assertThat(meterBinder).isInstanceOf(EhCache2Metrics.class);
 		}
 		finally {

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/cache/HazelcastCacheMeterBinderProviderTests.java

@@ -24,10 +24,11 @@ import io.micrometer.core.instrument.binder.MeterBinder;
 import io.micrometer.core.instrument.binder.cache.HazelcastCacheMetrics;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.Mockito;
 import org.mockito.junit.MockitoJUnitRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
 
 /**
  * Tests for {@link HazelcastCacheMeterBinderProvider}.
@@ -40,16 +41,11 @@ public class HazelcastCacheMeterBinderProviderTests {
 	@SuppressWarnings("unchecked")
 	@Test
 	public void hazelcastCacheProvider() {
-		IMap<Object, Object> nativeCache = Mockito.mock(IMap.class);
+		IMap<Object, Object> nativeCache = mock(IMap.class);
-
+		given(nativeCache.getName()).willReturn("test");
-		// It is not possible to create a real Hazelcast cache with a null name,
-		// so Micrometer's Hazelcast binder uses the name from the cache for its tag value.
-		Mockito.when(nativeCache.getName()).thenReturn("test");
-
 		HazelcastCache cache = new HazelcastCache(nativeCache);
-
 		MeterBinder meterBinder = new HazelcastCacheMeterBinderProvider()
-				.getMeterBinder(cache, "test", Collections.emptyList());
+				.getMeterBinder(cache, Collections.emptyList());
 		assertThat(meterBinder).isInstanceOf(HazelcastCacheMetrics.class);
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/cache/JCacheCacheMeterBinderProviderTests.java

@@ -52,7 +52,7 @@ public class JCacheCacheMeterBinderProviderTests {
 		given(this.nativeCache.getName()).willReturn("test");
 		JCacheCache cache = new JCacheCache(this.nativeCache);
 		MeterBinder meterBinder = new JCacheCacheMeterBinderProvider()
-				.getMeterBinder(cache, "test", Collections.emptyList());
+				.getMeterBinder(cache, Collections.emptyList());
 		assertThat(meterBinder).isInstanceOf(JCacheMetrics.class);
 	}
 

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -1297,7 +1297,6 @@ content into your application. Rather, pick only the properties that you need.
 	management.metrics.binders.logback.enabled=true # Whether to enable Logback metrics.
 	management.metrics.binders.processor.enabled=true # Whether to enable processor metrics.
 	management.metrics.binders.uptime.enabled=true # Whether to enable uptime metrics.
-	management.metrics.cache.metric-name=cache # Name of the metric for cache usage.
 	management.metrics.cache.instrument=true # Instrument all available caches.
 	management.metrics.export.atlas.batch-size= # Number of measurements per request to use for the backend. If more measurements are found, then multiple requests will be made.
 	management.metrics.export.atlas.config-refresh-frequency= # Frequency for refreshing config settings from the LWC service.

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -1194,10 +1194,9 @@ following information:
 [[production-ready-metrics-cache]]
 === Cache metrics
 Auto-configuration will enable the instrumentation of all available ``Cache``s on startup
-with a metric named `cache`. The prefix can be customized by using the
+with metrics prefixed with `cache.`. Cache instrumentation is standardized for a basic set
-`management.metrics.cache.metric-name` property. Cache instrumentation is specific
+of metrics. Additional, cache-specific metrics are also available. Please refer to
-to each cache library, refer to https://micrometer.io/docs[the micrometer documentation]
+https://micrometer.io/docs[the Micrometer documentation] for more details.
-for more details.
 
 The following cache libraries are supported:
 
@@ -1206,8 +1205,8 @@ The following cache libraries are supported:
 * Hazelcast
 * Any compliant JCache (JSR-107) implementation
 
-Metrics will also be tagged by the name of the `CacheManager` computed based on the bean
+Metrics are tagged by the name of the cache and by the name of the `CacheManager` that is
-name.
+derived from the bean name.
 
 NOTE: Only caches that are available on startup are bound to the registry. For caches
 created on-the-fly or programmatically after the startup phase, an explicit registration