Undeprecate 'management.metrics.tags'

Closes gh-38583

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

@@ -25,7 +25,6 @@
 import java.util.Map;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.boot.context.properties.DeprecatedConfigurationProperty;
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 
 /**
@@ -79,8 +78,6 @@ public Map<String, Boolean> getEnable() {
 		return this.enable;
 	}
 
-	@Deprecated(since = "3.2.0", forRemoval = true)
-	@DeprecatedConfigurationProperty(replacement = "management.observations.key-values", since = "3.2.0")
 	public Map<String, String> getTags() {
 		return this.tags;
 	}

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

@@ -50,7 +50,6 @@ public class PropertiesMeterFilter implements MeterFilter {
 
 	private final MeterFilter mapFilter;
 
-	@SuppressWarnings("removal")
 	public PropertiesMeterFilter(MetricsProperties properties) {
 		Assert.notNull(properties, "Properties must not be null");
 		this.properties = properties;

spring-boot-project/spring-boot-docs/src/docs/asciidoc/actuator/metrics.adoc

@@ -1111,8 +1111,19 @@ These use the global registry that is not Spring-managed.
 
 [[actuator.metrics.customizing.common-tags]]
 ==== Common Tags
+Common tags are generally used for dimensional drill-down on the operating environment, such as host, instance, region, stack, and others.
+Commons tags are applied to all meters and can be configured, as the following example shows:
 
-You can configure common tags using the <<actuator#actuator.observability.common-key-values, configprop:management.observations.key-values[] property>>.
+[source,yaml,indent=0,subs="verbatim",configprops,configblocks]
+----
+	management:
+	  metrics:
+	    tags:
+	      region: "us-east-1"
+	      stack: "prod"
+----
+
+The preceding example adds `region` and `stack` tags to all meters with a value of `us-east-1` and `prod`, respectively.
 
 NOTE: The order of common tags is important if you use Graphite.
 As the order of common tags cannot be guaranteed by using this approach, Graphite users are advised to define a custom `MeterFilter` instead.