Fix checkstyle issue

Author: Technoboy-

pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/BrokerOperabilityMetrics.java

@@ -30,7 +30,7 @@
 /**
  */
 public class BrokerOperabilityMetrics {
-    private final Counter TOPIC_LOAD_FAILED = Counter.build("topic_load_failed", "-").register();
+    private final Counter topicLoadFailedCount;
     private final List<Metrics> metricsList;
     private final String localCluster;
     private final DimensionStats topicLoadStats;
@@ -45,6 +45,7 @@ public BrokerOperabilityMetrics(String localCluster, String brokerName) {
         this.metricsList = new ArrayList<>();
         this.localCluster = localCluster;
         this.topicLoadStats = new DimensionStats("topic_load_times", 60);
+        this.topicLoadFailedCount = Counter.build("topic_load_failed", "-").register();
         this.brokerName = brokerName;
         this.connectionTotalCreatedCount = new LongAdder();
         this.connectionCreateSuccessCount = new LongAdder();
@@ -87,7 +88,7 @@ Map<String, String> getDimensionMap(String metricsName) {
 
     Metrics getTopicLoadMetrics() {
         Metrics metrics = getDimensionMetrics("topic_load_times", "topic_load", topicLoadStats);
-        metrics.put("brk_topic_load_failed_count", TOPIC_LOAD_FAILED.get());
+        metrics.put("brk_topic_load_failed_count", topicLoadFailedCount.get());
         return metrics;
     }
 
@@ -117,7 +118,7 @@ public void recordTopicLoadTimeValue(long topicLoadLatencyMs) {
     }
 
     public void recordTopicLoadFailed() {
-        this.TOPIC_LOAD_FAILED.inc();
+        this.topicLoadFailedCount.inc();
     }
 
     public void recordConnectionCreate() {