Add logging for tests in RemoteStoreStatsIT to catch assertion failure cause (#11734)

* Add logging for tests in RemoteStoreStatsIT to catch assertion failure cause

Signed-off-by: Poojita Raj <poojiraj@amazon.com>

* Add test logging annotation for trace logs

Signed-off-by: Poojita Raj <poojiraj@amazon.com>

---------

Signed-off-by: Poojita Raj <poojiraj@amazon.com>

Author: Poojita-Raj

server/src/internalClusterTest/java/org/opensearch/remotestore/RemoteStoreStatsIT.java

@@ -29,6 +29,7 @@
 import org.opensearch.test.InternalTestCluster;
 import org.opensearch.test.OpenSearchIntegTestCase;
 import org.opensearch.test.disruption.NetworkDisruption;
+import org.opensearch.test.junit.annotations.TestLogging;
 import org.opensearch.test.transport.MockTransportService;
 
 import java.io.IOException;
@@ -249,6 +250,7 @@ public void testStatsResponseFromLocalNode() {
         }
     }
 
+    @TestLogging(reason = "Getting trace logs from remote store package", value = "org.opensearch.remotestore:TRACE")
     public void testDownloadStatsCorrectnessSinglePrimarySingleReplica() throws Exception {
         setup();
         // Scenario:
@@ -277,6 +279,13 @@ public void testDownloadStatsCorrectnessSinglePrimarySingleReplica() throws Exce
             .collect(Collectors.toList())
             .get(0)
             .getSegmentStats();
+        logger.info(
+            "Zero state primary stats: {}ms refresh time lag, {}b bytes lag, {}b upload bytes started and {}b upload bytes failed.",
+            zeroStatePrimaryStats.refreshTimeLagMs,
+            zeroStatePrimaryStats.bytesLag,
+            zeroStatePrimaryStats.uploadBytesStarted,
+            zeroStatePrimaryStats.uploadBytesFailed
+        );
         assertTrue(
             zeroStatePrimaryStats.totalUploadsStarted == zeroStatePrimaryStats.totalUploadsSucceeded
                 && zeroStatePrimaryStats.totalUploadsSucceeded == 1
@@ -339,6 +348,7 @@ public void testDownloadStatsCorrectnessSinglePrimarySingleReplica() throws Exce
         }
     }
 
+    @TestLogging(reason = "Getting trace logs from remote store package", value = "org.opensearch.remotestore:TRACE")
     public void testDownloadStatsCorrectnessSinglePrimaryMultipleReplicaShards() throws Exception {
         setup();
         // Scenario:
@@ -371,6 +381,13 @@ public void testDownloadStatsCorrectnessSinglePrimaryMultipleReplicaShards() thr
             .collect(Collectors.toList())
             .get(0)
             .getSegmentStats();
+        logger.info(
+            "Zero state primary stats: {}ms refresh time lag, {}b bytes lag, {}b upload bytes started and {}b upload bytes failed.",
+            zeroStatePrimaryStats.refreshTimeLagMs,
+            zeroStatePrimaryStats.bytesLag,
+            zeroStatePrimaryStats.uploadBytesStarted,
+            zeroStatePrimaryStats.uploadBytesFailed
+        );
         assertTrue(
             zeroStatePrimaryStats.totalUploadsStarted == zeroStatePrimaryStats.totalUploadsSucceeded
                 && zeroStatePrimaryStats.totalUploadsSucceeded == 1