[Minor]Add metadata-related logs and missing UT for kill tasks. (#10956)

* logs more info when delete segments && add deleteSegments-related UT

* revert msic.xml

* code review

* use log.debugSegments

Co-authored-by: yuezhang <yuezhang@freewheel.tv>

server/src/main/java/org/apache/druid/metadata/IndexerSQLMetadataStorageCoordinator.java

@@ -1278,9 +1278,14 @@ public class IndexerSQLMetadataStorageCoordinator implements IndexerMetadataStor
           @Override
           public Void inTransaction(Handle handle, TransactionStatus transactionStatus)
           {
+            int segmentSize = segments.size();
+            String dataSource = "";
             for (final DataSegment segment : segments) {
+              dataSource = segment.getDataSource();
               deleteSegment(handle, segment);
             }
+            log.debugSegments(segments, "Delete the metadata of segments");
+            log.info("Removed [%d] segments from metadata storage for dataSource [%s]!", segmentSize, dataSource);
 
             return null;
           }

server/src/test/java/org/apache/druid/metadata/IndexerSQLMetadataStorageCoordinatorTest.java

@@ -848,6 +848,39 @@ public class IndexerSQLMetadataStorageCoordinatorTest
     Assert.assertNull("getDataSourceMetadataNullAfterDelete", coordinator.retrieveDataSourceMetadata("fooDataSource"));
   }
 
+  @Test
+  public void testDeleteSegmentsInMetaDataStorage() throws IOException
+  {
+    // Published segments to MetaDataStorage
+    coordinator.announceHistoricalSegments(SEGMENTS);
+
+    // check segments Published
+    Assert.assertEquals(
+            SEGMENTS,
+            ImmutableSet.copyOf(
+                    coordinator.retrieveUsedSegmentsForInterval(
+                            defaultSegment.getDataSource(),
+                            defaultSegment.getInterval(),
+                            Segments.ONLY_VISIBLE
+                    )
+            )
+    );
+    // remove segments in MetaDataStorage
+    coordinator.deleteSegments(SEGMENTS);
+
+    // check segments removed
+    Assert.assertEquals(
+            0,
+            ImmutableSet.copyOf(
+                    coordinator.retrieveUsedSegmentsForInterval(
+                            defaultSegment.getDataSource(),
+                            defaultSegment.getInterval(),
+                            Segments.ONLY_VISIBLE
+                    )
+            ).size()
+    );
+  }
+
   @Test
   public void testSingleAdditionalNumberedShardWithNoCorePartitions() throws IOException
   {