Stop auto-configuring a StatsdMetrics bean

StatsD no longer publishes metrics about itself and StatsDMetrics is
deprecated as a result. This commit removes the auto-configuration of
it.

Closes gh-20836

Author: snicoll

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

@@ -1,5 +1,5 @@
 /*
- * 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.
@@ -19,7 +19,6 @@
 import io.micrometer.core.instrument.Clock;
 import io.micrometer.statsd.StatsdConfig;
 import io.micrometer.statsd.StatsdMeterRegistry;
-import io.micrometer.statsd.StatsdMetrics;
 
 import org.springframework.boot.actuate.autoconfigure.metrics.CompositeMeterRegistryAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
@@ -63,9 +62,4 @@ public StatsdMeterRegistry statsdMeterRegistry(StatsdConfig statsdConfig, Clock
 		return new StatsdMeterRegistry(statsdConfig, clock);
 	}
 
-	@Bean
-	public StatsdMetrics statsdMetrics() {
-		return new StatsdMetrics();
-	}
-
 }

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

@@ -1,5 +1,5 @@
 /*
- * 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.
@@ -19,7 +19,6 @@
 import io.micrometer.core.instrument.Clock;
 import io.micrometer.statsd.StatsdConfig;
 import io.micrometer.statsd.StatsdMeterRegistry;
-import io.micrometer.statsd.StatsdMetrics;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
@@ -47,9 +46,8 @@ void backsOffWithoutAClock() {
 
 	@Test
 	void autoConfiguresItsConfigMeterRegistryAndMetrics() {
-		this.contextRunner.withUserConfiguration(BaseConfiguration.class)
-				.run((context) -> assertThat(context).hasSingleBean(StatsdMeterRegistry.class)
-						.hasSingleBean(StatsdConfig.class).hasSingleBean(StatsdMetrics.class));
+		this.contextRunner.withUserConfiguration(BaseConfiguration.class).run((context) -> assertThat(context)
+				.hasSingleBean(StatsdMeterRegistry.class).hasSingleBean(StatsdConfig.class));
 	}
 
 	@Test