[Backport 0.5-nexus] Add opensearch related metrics

flint-core/src/main/java/org/opensearch/flint/core/IRestHighLevelClient.java

@@ -87,6 +87,10 @@ static void recordOperationSuccess(String metricNamePrefix) {
         MetricsUtil.incrementCounter(successMetricName);
     }
 
+    static void recordLatency(String metricNamePrefix, long latencyMilliseconds) {
+        MetricsUtil.addHistoricGauge(metricNamePrefix + ".processingTime", latencyMilliseconds);
+    }
+
     /**
      * Records the failure of an OpenSearch operation by incrementing the corresponding metric counter.
      * If the exception is an OpenSearchException with a specific status code (e.g., 403),
@@ -107,6 +111,8 @@ static void recordOperationFailure(String metricNamePrefix, Exception e) {
         if (statusCode == 403) {
             String forbiddenErrorMetricName = metricNamePrefix + ".403.count";
             MetricsUtil.incrementCounter(forbiddenErrorMetricName);
+        } else if (statusCode == 429) {
+            MetricsUtil.incrementCounter(metricNamePrefix + ".429.count");
         }
 
         String failureMetricName = metricNamePrefix + "." + (statusCode / 100) + "xx.count";

flint-core/src/main/java/org/opensearch/flint/core/RestHighLevelClientWrapper.java

@@ -5,6 +5,8 @@
 
 package org.opensearch.flint.core;
 
+import java.util.Arrays;
+import java.util.function.Consumer;
 import org.opensearch.action.admin.indices.delete.DeleteIndexRequest;
 import org.opensearch.action.bulk.BulkRequest;
 import org.opensearch.action.bulk.BulkResponse;
@@ -40,7 +42,10 @@
 import org.opensearch.flint.core.storage.BulkRequestRateLimiter;
 import org.opensearch.flint.core.storage.OpenSearchBulkRetryWrapper;
 
+import static org.opensearch.flint.core.metrics.MetricConstants.OS_BULK_OP_METRIC_PREFIX;
+import static org.opensearch.flint.core.metrics.MetricConstants.OS_CREATE_OP_METRIC_PREFIX;
 import static org.opensearch.flint.core.metrics.MetricConstants.OS_READ_OP_METRIC_PREFIX;
+import static org.opensearch.flint.core.metrics.MetricConstants.OS_SEARCH_OP_METRIC_PREFIX;
 import static org.opensearch.flint.core.metrics.MetricConstants.OS_WRITE_OP_METRIC_PREFIX;
 
 /**
@@ -67,112 +72,126 @@ public RestHighLevelClientWrapper(RestHighLevelClient client, BulkRequestRateLim
 
     @Override
     public BulkResponse bulk(BulkRequest bulkRequest, RequestOptions options) throws IOException {
-      return execute(OS_WRITE_OP_METRIC_PREFIX, () -> {
+      return execute(() -> {
         try {
           rateLimiter.acquirePermit();
           return bulkRetryWrapper.bulkWithPartialRetry(client, bulkRequest, options);
         } catch (InterruptedException e) {
           throw new RuntimeException("rateLimiter.acquirePermit was interrupted.", e);
         }
-      });
+      }, OS_WRITE_OP_METRIC_PREFIX, OS_BULK_OP_METRIC_PREFIX);
     }
 
     @Override
     public ClearScrollResponse clearScroll(ClearScrollRequest clearScrollRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.clearScroll(clearScrollRequest, options));
+        return execute(() -> client.clearScroll(clearScrollRequest, options),
+            OS_READ_OP_METRIC_PREFIX);
     }
 
     @Override
     public CreateIndexResponse createIndex(CreateIndexRequest createIndexRequest, RequestOptions options) throws IOException {
-        return execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.indices().create(createIndexRequest, options));
+        return execute(() -> client.indices().create(createIndexRequest, options),
+            OS_WRITE_OP_METRIC_PREFIX, OS_CREATE_OP_METRIC_PREFIX);
     }
 
     @Override
     public void updateIndexMapping(PutMappingRequest putMappingRequest, RequestOptions options) throws IOException {
-        execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.indices().putMapping(putMappingRequest, options));
+        execute(() -> client.indices().putMapping(putMappingRequest, options),
+            OS_WRITE_OP_METRIC_PREFIX);
     }
 
     @Override
     public void deleteIndex(DeleteIndexRequest deleteIndexRequest, RequestOptions options) throws IOException {
-        execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.indices().delete(deleteIndexRequest, options));
+        execute(() -> client.indices().delete(deleteIndexRequest, options),
+            OS_WRITE_OP_METRIC_PREFIX);
     }
 
     @Override
     public DeleteResponse delete(DeleteRequest deleteRequest, RequestOptions options) throws IOException {
-        return execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.delete(deleteRequest, options));
+        return execute(() -> client.delete(deleteRequest, options), OS_WRITE_OP_METRIC_PREFIX);
     }
 
     @Override
     public GetResponse get(GetRequest getRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.get(getRequest, options));
+        return execute(() -> client.get(getRequest, options), OS_READ_OP_METRIC_PREFIX);
     }
 
     @Override
     public GetIndexResponse getIndex(GetIndexRequest getIndexRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.indices().get(getIndexRequest, options));
+        return execute(() -> client.indices().get(getIndexRequest, options),
+            OS_READ_OP_METRIC_PREFIX);
     }
 
     @Override
     public IndexResponse index(IndexRequest indexRequest, RequestOptions options) throws IOException {
-        return execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.index(indexRequest, options));
+        return execute(() -> client.index(indexRequest, options), OS_WRITE_OP_METRIC_PREFIX);
     }
 
     @Override
     public Boolean doesIndexExist(GetIndexRequest getIndexRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.indices().exists(getIndexRequest, options));
+        return execute(() -> client.indices().exists(getIndexRequest, options),
+            OS_READ_OP_METRIC_PREFIX);
     }
 
     @Override
     public SearchResponse search(SearchRequest searchRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.search(searchRequest, options));
+        return execute(() -> client.search(searchRequest, options), OS_READ_OP_METRIC_PREFIX, OS_SEARCH_OP_METRIC_PREFIX);
     }
 
     @Override
     public SearchResponse scroll(SearchScrollRequest searchScrollRequest, RequestOptions options) throws IOException {
-        return execute(OS_READ_OP_METRIC_PREFIX, () -> client.scroll(searchScrollRequest, options));
+        return execute(() -> client.scroll(searchScrollRequest, options), OS_READ_OP_METRIC_PREFIX);
     }
 
     @Override
     public UpdateResponse update(UpdateRequest updateRequest, RequestOptions options) throws IOException {
-        return execute(OS_WRITE_OP_METRIC_PREFIX, () -> client.update(updateRequest, options));
+        return execute(() -> client.update(updateRequest, options), OS_WRITE_OP_METRIC_PREFIX);
     }
 
-  @Override
-  public IndicesStatsResponse stats(IndicesStatsRequest request) throws IOException {
-    return execute(OS_READ_OP_METRIC_PREFIX,
-        () -> {
-          OpenSearchClient openSearchClient =
-              new OpenSearchClient(new RestClientTransport(client.getLowLevelClient(),
-                  new JacksonJsonpMapper()));
-          return openSearchClient.indices().stats(request);
-        });
-  }
+    @Override
+    public IndicesStatsResponse stats(IndicesStatsRequest request) throws IOException {
+        return execute(() -> {
+              OpenSearchClient openSearchClient =
+                  new OpenSearchClient(new RestClientTransport(client.getLowLevelClient(),
+                      new JacksonJsonpMapper()));
+              return openSearchClient.indices().stats(request);
+            }, OS_READ_OP_METRIC_PREFIX
+        );
+    }
 
     @Override
     public CreatePitResponse createPit(CreatePitRequest request) throws IOException {
-        return execute(OS_WRITE_OP_METRIC_PREFIX, () -> openSearchClient().createPit(request));
+        return execute(() -> openSearchClient().createPit(request), OS_WRITE_OP_METRIC_PREFIX);
     }
 
     /**
      * Executes a given operation, tracks metrics, and handles exceptions.
      *
-     * @param metricNamePrefix the prefix for the metric name
-     * @param operation        the operation to execute
      * @param <T>              the return type of the operation
+     * @param operation        the operation to execute
+     * @param metricNamePrefixes array of prefixes for the metric name
      * @return the result of the operation
      * @throws IOException if an I/O exception occurs
      */
-    private <T> T execute(String metricNamePrefix, IOCallable<T> operation) throws IOException {
+    private <T> T execute(IOCallable<T> operation, String... metricNamePrefixes) throws IOException {
+        long startTime = System.currentTimeMillis();
         try {
             T result = operation.call();
-            IRestHighLevelClient.recordOperationSuccess(metricNamePrefix);
+            eachPrefix(IRestHighLevelClient::recordOperationSuccess, metricNamePrefixes);
             return result;
         } catch (Exception e) {
-            IRestHighLevelClient.recordOperationFailure(metricNamePrefix, e);
+            eachPrefix(prefix -> IRestHighLevelClient.recordOperationFailure(prefix, e), metricNamePrefixes);
             throw e;
+        } finally {
+            long latency = System.currentTimeMillis() - startTime;
+            eachPrefix(prefix -> IRestHighLevelClient.recordLatency(prefix, latency), metricNamePrefixes);
         }
     }
 
+    private static void eachPrefix(Consumer<String> fn, String... prefixes) {
+        Arrays.stream(prefixes).forEach(fn);
+    }
+
     /**
      * Functional interface for operations that can throw IOException.
      *

flint-core/src/main/java/org/opensearch/flint/core/metrics/HistoricGauge.java

@@ -6,6 +6,7 @@
 package org.opensearch.flint.core.metrics;
 
 import com.codahale.metrics.Gauge;
+import com.google.common.annotations.VisibleForTesting;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedList;
@@ -60,4 +61,9 @@ public List<DataPoint> pollDataPoints() {
     }
     return result;
   }
+
+  @VisibleForTesting
+  public List<DataPoint> getDataPoints() {
+    return dataPoints;
+  }
 }

flint-core/src/main/java/org/opensearch/flint/core/metrics/MetricConstants.java

@@ -22,6 +22,24 @@ public final class MetricConstants {
      */
     public static final String OS_WRITE_OP_METRIC_PREFIX = "opensearch.write";
 
+    /**
+     * Prefixes for OpenSearch API specific metrics
+     */
+    public static final String OS_CREATE_OP_METRIC_PREFIX = "opensearch.create";
+    public static final String OS_SEARCH_OP_METRIC_PREFIX = "opensearch.search";
+    public static final String OS_BULK_OP_METRIC_PREFIX = "opensearch.bulk";
+
+    /**
+     * Metric name for request size of opensearch bulk request
+     */
+    public static final String OPENSEARCH_BULK_SIZE_METRIC = "opensearch.bulk.size.count";
+
+    /**
+     * Metric name for opensearch bulk request retry count
+     */
+    public static final String OPENSEARCH_BULK_RETRY_COUNT_METRIC = "opensearch.bulk.retry.count";
+    public static final String OPENSEARCH_BULK_ALL_RETRY_FAILED_COUNT_METRIC = "opensearch.bulk.allRetryFailed.count";
+
     /**
      * Metric name for counting the errors encountered with Amazon S3 operations.
      */

flint-core/src/main/scala/org/opensearch/flint/core/storage/OpenSearchBulkRetryWrapper.java

@@ -6,6 +6,7 @@
 import dev.failsafe.function.CheckedPredicate;
 import java.util.Arrays;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 import org.opensearch.action.DocWriteRequest;
@@ -15,6 +16,8 @@
 import org.opensearch.client.RequestOptions;
 import org.opensearch.client.RestHighLevelClient;
 import org.opensearch.flint.core.http.FlintRetryOptions;
+import org.opensearch.flint.core.metrics.MetricConstants;
+import org.opensearch.flint.core.metrics.MetricsUtil;
 import org.opensearch.rest.RestStatus;
 
 public class OpenSearchBulkRetryWrapper {
@@ -37,23 +40,35 @@ public OpenSearchBulkRetryWrapper(FlintRetryOptions retryOptions) {
    */
   public BulkResponse bulkWithPartialRetry(RestHighLevelClient client, BulkRequest bulkRequest,
       RequestOptions options) {
+    final AtomicInteger requestCount = new AtomicInteger(0);
     try {
       final AtomicReference<BulkRequest> nextRequest = new AtomicReference<>(bulkRequest);
-      return Failsafe
+      BulkResponse res = Failsafe
           .with(retryPolicy)
+          .onFailure((event) -> {
+            if (event.isRetry()) {
+              MetricsUtil.addHistoricGauge(
+                  MetricConstants.OPENSEARCH_BULK_ALL_RETRY_FAILED_COUNT_METRIC, 1);
+            }
+          })
           .get(() -> {
+            requestCount.incrementAndGet();
             BulkResponse response = client.bulk(nextRequest.get(), options);
             if (retryPolicy.getConfig().allowsRetries() && bulkItemRetryableResultPredicate.test(
                 response)) {
               nextRequest.set(getRetryableRequest(nextRequest.get(), response));
             }
             return response;
           });
+      return res;
     } catch (FailsafeException ex) {
       LOG.severe("Request failed permanently. Re-throwing original exception.");
 
       // unwrap original exception and throw
       throw new RuntimeException(ex.getCause());
+    } finally {
+      MetricsUtil.addHistoricGauge(MetricConstants.OPENSEARCH_BULK_SIZE_METRIC, bulkRequest.estimatedSizeInBytes());
+      MetricsUtil.addHistoricGauge(MetricConstants.OPENSEARCH_BULK_RETRY_COUNT_METRIC, requestCount.get() - 1);
     }
   }
 

flint-core/src/test/java/org/opensearch/flint/core/metrics/MetricsTestUtil.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.flint.core.metrics;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.when;
+
+import com.codahale.metrics.MetricRegistry;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import org.apache.spark.SparkEnv;
+import org.apache.spark.metrics.source.Source;
+import org.mockito.MockedStatic;
+import org.opensearch.flint.core.metrics.HistoricGauge.DataPoint;
+
+/**
+ * Utility class for verifying metrics
+ */
+public class MetricsTestUtil {
+  @AllArgsConstructor
+  public static class MetricsVerifier {
+
+    final MetricRegistry metricRegistry;
+
+    public void assertMetricExist(String metricName) {
+      assertNotNull(metricRegistry.getMetrics().get(metricName));
+    }
+
+    public void assertMetricClass(String metricName, Class<?> clazz) {
+      assertMetricExist(metricName);
+      assertEquals(clazz, metricRegistry.getMetrics().get(metricName).getClass());
+    }
+
+    public void assertHistoricGauge(String metricName, long... values) {
+      HistoricGauge historicGauge = getHistoricGauge(metricName);
+      List<DataPoint> dataPoints = historicGauge.getDataPoints();
+      for (int i = 0; i < values.length; i++) {
+        assertEquals(values[i], dataPoints.get(i).getValue().longValue());
+      }
+    }
+
+    private HistoricGauge getHistoricGauge(String metricName) {
+      assertMetricClass(metricName, HistoricGauge.class);
+      return (HistoricGauge) metricRegistry.getMetrics().get(metricName);
+    }
+
+    public void assertMetricNotExist(String metricName) {
+      assertNull(metricRegistry.getMetrics().get(metricName));
+    }
+  }
+
+  @FunctionalInterface
+  public interface ThrowableConsumer<T> {
+    void accept(T t) throws Exception;
+  }
+
+  public static void withMetricEnv(ThrowableConsumer<MetricsVerifier> test) throws Exception {
+    try (MockedStatic<SparkEnv> sparkEnvMock = mockStatic(SparkEnv.class)) {
+      SparkEnv sparkEnv = mock(SparkEnv.class, RETURNS_DEEP_STUBS);
+      sparkEnvMock.when(SparkEnv::get).thenReturn(sparkEnv);
+
+      Source metricSource = mock(Source.class);
+      MetricRegistry metricRegistry = new MetricRegistry();
+      when(metricSource.metricRegistry()).thenReturn(metricRegistry);
+      when(sparkEnv.metricsSystem().getSourcesByName(any()).head()).thenReturn(metricSource);
+
+      test.accept(new MetricsVerifier(metricRegistry));
+    }
+  }
+}