Merge branch '1.8.x' into 1.9.x

Author: jonatan-ivanov

implementations/micrometer-registry-statsd/src/test/java/io/micrometer/statsd/StatsdMeterRegistryPublishTest.java

@@ -63,7 +63,7 @@ class StatsdMeterRegistryPublishTest {
 
     DisposableChannel server;
 
-    CountDownLatch serverLatch;
+    volatile CountDownLatch serverLatch;
 
     AtomicInteger serverMetricReadCount = new AtomicInteger();