Merge branch '1.1.x' into 1.2.x

micrometer-core/src/main/java/io/micrometer/core/instrument/binder/jvm/JvmGcMetrics.java

@@ -23,8 +23,6 @@
 import io.micrometer.core.lang.NonNullApi;
 import io.micrometer.core.lang.NonNullFields;
 import io.micrometer.core.lang.Nullable;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import javax.management.ListenerNotFoundException;
 import javax.management.NotificationEmitter;
@@ -54,8 +52,6 @@
 @NonNullFields
 public class JvmGcMetrics implements MeterBinder, AutoCloseable {
 
-    private static final Logger logger = LoggerFactory.getLogger(JvmGcMetrics.class);
-
     private final boolean managementExtensionsPresent = isManagementExtensionsPresent();
 
     private final Iterable<Tag> tags;
@@ -199,8 +195,7 @@ private static boolean isManagementExtensionsPresent() {
             return true;
         } catch (Throwable e) {
             // We are operating in a JVM without access to this level of detail
-            logger.warn("GC notifications will not be available because " +
-                "com.sun.management.GarbageCollectionNotificationInfo is not present");
+            // TODO log a message about the unavailable class; see gh-1572
             return false;
         }
     }