Support `management.health.probes.enabled=false`

Update `AvailabilityProbesAutoConfiguration` to allow the
`management.health.probes.enabled` property to override the platform
detection logic. Prior to this commit, it was possible to use the
property to enable the probes, but it was not possible to disable
them when deploying to Kubernates.

See gh-20962

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/availability/AvailabilityProbesAutoConfiguration.java

@@ -16,7 +16,7 @@
 
 package org.springframework.boot.actuate.autoconfigure.availability;
 
-import org.springframework.boot.actuate.autoconfigure.availability.AvailabilityProbesAutoConfiguration.KubernetesOrPropertyCondition;
+import org.springframework.boot.actuate.autoconfigure.availability.AvailabilityProbesAutoConfiguration.ProbesCondition;
 import org.springframework.boot.actuate.autoconfigure.health.ConditionalOnEnabledHealthIndicator;
 import org.springframework.boot.actuate.availability.LivenessStateHealthIndicator;
 import org.springframework.boot.actuate.availability.ReadinessStateHealthIndicator;
@@ -24,15 +24,18 @@ import org.springframework.boot.actuate.health.HealthEndpointGroupsRegistryCusto
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration;
-import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnCloudPlatform;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.availability.ApplicationAvailability;
 import org.springframework.boot.cloud.CloudPlatform;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ConditionContext;
 import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.Environment;
+import org.springframework.core.type.AnnotatedTypeMetadata;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for
@@ -43,7 +46,7 @@ import org.springframework.context.annotation.Configuration;
  * @since 2.3.0
  */
 @Configuration(proxyBeanMethods = false)
-@Conditional(KubernetesOrPropertyCondition.class)
+@Conditional(ProbesCondition.class)
 @AutoConfigureAfter(ApplicationAvailabilityAutoConfiguration.class)
 public class AvailabilityProbesAutoConfiguration {
 
@@ -67,20 +70,25 @@ public class AvailabilityProbesAutoConfiguration {
 		return new AvailabilityProbesHealthEndpointGroupsRegistrar();
 	}
 
-	static class KubernetesOrPropertyCondition extends AnyNestedCondition {
-
-		KubernetesOrPropertyCondition() {
-			super(ConfigurationPhase.PARSE_CONFIGURATION);
-		}
-
-		@ConditionalOnCloudPlatform(CloudPlatform.KUBERNETES)
-		static class Kubernetes {
-
-		}
-
-		@ConditionalOnProperty(prefix = "management.health.probes", name = "enabled")
-		static class ProbesIndicatorsEnabled {
+	/**
+	 * {@link SpringBootCondition} to enable or disable probes.
+	 */
+	static class ProbesCondition extends SpringBootCondition {
 
+		@Override
+		public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
+			Environment environment = context.getEnvironment();
+			ConditionMessage.Builder message = ConditionMessage.forCondition("Health probes");
+			String enabled = environment.getProperty("management.health.probes.enabled");
+			if (enabled != null) {
+				boolean match = !"false".equalsIgnoreCase(enabled);
+				return new ConditionOutcome(match,
+						message.because("'management.health.probes.enabled' set to '" + enabled + "'"));
+			}
+			if (CloudPlatform.getActive(environment) == CloudPlatform.KUBERNETES) {
+				return ConditionOutcome.match(message.because("running on Kubernetes"));
+			}
+			return ConditionOutcome.noMatch(message.because("not running on a supported cloud platform"));
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/availability/AvailabilityProbesAutoConfigurationTests.java

@@ -39,7 +39,7 @@ class AvailabilityProbesAutoConfigurationTests {
 			.of(ApplicationAvailabilityAutoConfiguration.class, AvailabilityProbesAutoConfiguration.class));
 
 	@Test
-	void probesNotConfiguredIfNotKubernetes() {
+	void probesWhenNotKubernetesAddsNoBeans() {
 		this.contextRunner.run((context) -> assertThat(context).hasSingleBean(ApplicationAvailability.class)
 				.doesNotHaveBean(LivenessStateHealthIndicator.class)
 				.doesNotHaveBean(ReadinessStateHealthIndicator.class)
@@ -47,7 +47,16 @@ class AvailabilityProbesAutoConfigurationTests {
 	}
 
 	@Test
-	void probesConfiguredIfProperty() {
+	void probesWhenKubernetesAddsBeans() {
+		this.contextRunner.withPropertyValues("spring.main.cloud-platform=kubernetes")
+				.run((context) -> assertThat(context).hasSingleBean(ApplicationAvailability.class)
+						.hasSingleBean(LivenessStateHealthIndicator.class)
+						.hasSingleBean(ReadinessStateHealthIndicator.class)
+						.hasSingleBean(HealthEndpointGroupsRegistryCustomizer.class));
+	}
+
+	@Test
+	void probesWhenPropertyEnabledAddsBeans() {
 		this.contextRunner.withPropertyValues("management.health.probes.enabled=true")
 				.run((context) -> assertThat(context).hasSingleBean(ApplicationAvailability.class)
 						.hasSingleBean(LivenessStateHealthIndicator.class)
@@ -55,4 +64,14 @@ class AvailabilityProbesAutoConfigurationTests {
 						.hasSingleBean(HealthEndpointGroupsRegistryCustomizer.class));
 	}
 
+	@Test
+	void probesWhenKuberntesAndPropertyDisabledAddsNotBeans() {
+		this.contextRunner
+				.withPropertyValues("spring.main.cloud-platform=kubernetes", "management.health.probes.enabled=false")
+				.run((context) -> assertThat(context).hasSingleBean(ApplicationAvailability.class)
+						.doesNotHaveBean(LivenessStateHealthIndicator.class)
+						.doesNotHaveBean(ReadinessStateHealthIndicator.class)
+						.doesNotHaveBean(HealthEndpointGroupsRegistryCustomizer.class));
+	}
+
 }