Merge remote-tracking branch 'origin/3.1.x'

spring-cloud-loadbalancer/src/main/java/org/springframework/cloud/loadbalancer/blocking/client/BlockingLoadBalancerClient.java

@@ -94,6 +94,9 @@ public class BlockingLoadBalancerClient implements LoadBalancerClient {
 	@Override
 	public <T> T execute(String serviceId, ServiceInstance serviceInstance, LoadBalancerRequest<T> request)
 			throws IOException {
+		if (serviceInstance == null) {
+			throw new IllegalArgumentException("Service Instance cannot be null");
+		}
 		DefaultResponse defaultResponse = new DefaultResponse(serviceInstance);
 		Set<LoadBalancerLifecycle> supportedLifecycleProcessors = getSupportedLifecycleProcessors(serviceId);
 		Request lbRequest = request instanceof Request ? (Request) request : new DefaultRequest<>();

spring-cloud-loadbalancer/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -38,6 +38,12 @@
 			"name": "spring.cloud.loadbalancer.eager-load.clients",
 			"description": "Names of the clients.",
 			"type": "java.util.List"
+		},
+		{
+			"defaultValue": "false",
+			"name": "spring.cloud.loadbalancer.stats.micrometer.enabled",
+			"description": "Enables Spring Cloud LoadBalancer Micrometer stats.",
+			"type": "java.lang.Boolean"
 		}
 	]
 }