minor cleanup

src/main/java/at/ac/uibk/gitsearch/service/MonitoringService.java

 package at.ac.uibk.gitsearch.service;
 
-import at.ac.uibk.gitsearch.service.dto.StatisticsDTO;
-import at.ac.uibk.gitsearch.service.impl.StatisticsServiceImpl;
-import io.micrometer.core.instrument.MeterRegistry;
-import io.micrometer.core.instrument.Metrics;
-import io.micrometer.core.instrument.Tag;
-import io.micrometer.core.instrument.Tags;
 import java.io.IOException;
-import java.net.ConnectException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
+
 import org.codeability.sharing.plugins.api.search.SearchResultDTO;
 import org.codeability.sharing.plugins.api.search.SearchResultsDTO;
 import org.codeability.sharing.plugins.api.search.UserProvidedMetadataDTO;
@@ -23,6 +21,13 @@ import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import at.ac.uibk.gitsearch.service.dto.StatisticsDTO;
+import at.ac.uibk.gitsearch.service.impl.StatisticsServiceImpl;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.Metrics;
+import io.micrometer.core.instrument.Tag;
+import io.micrometer.core.instrument.Tags;
+
 /**
  * Service class for monitoring
  *