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https://issues.apache.org/jira/browse/GOBBLIN-2209?focusedWorklogId=975403&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-975403
 ]

ASF GitHub Bot logged work on GOBBLIN-2209:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/Jul/25 07:21
            Start Date: 21/Jul/25 07:21
    Worklog Time Spent: 10m 
      Work Description: Blazer-007 commented on code in PR #4118:
URL: https://github.com/apache/gobblin/pull/4118#discussion_r2218392260


##########
gobblin-metrics-libs/gobblin-metrics/src/main/java/org/apache/gobblin/metrics/opentelemetry/OpenTelemetryInstrumentation.java:
##########
@@ -0,0 +1,167 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.gobblin.metrics.opentelemetry;
+
+import java.lang.reflect.Method;
+import java.util.Properties;
+import java.util.concurrent.ConcurrentHashMap;
+
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+import com.google.common.base.Splitter;
+
+import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.common.AttributesBuilder;
+import io.opentelemetry.api.metrics.Meter;
+
+import org.apache.gobblin.configuration.ConfigurationKeys;
+import org.apache.gobblin.configuration.State;
+import org.apache.gobblin.metrics.InMemoryOpenTelemetryMetrics;
+import org.apache.gobblin.metrics.OpenTelemetryMetricsBase;
+import org.apache.gobblin.service.ServiceConfigKeys;
+
+
+/**
+ * Provides OpenTelemetry instrumentation for metrics.
+ *
+ * <p>Maintains a singleton instance that holds common attributes {@link 
Attributes} and a Meter {@link Meter}.
+ * Exposes methods to retrieve or create metric instruments defined in {@link 
GaaSOpenTelemetryMetrics}.
+ */
+@Slf4j
+@Getter
+public class OpenTelemetryInstrumentation {
+
+  // Adding the gobblin-service.main 
(BaseFlowGraphHelper.FLOW_EDGE_LABEL_JOINER_CHAR) dependency is creating 
circular dependency issues
+  private static final String FLOW_EDGE_LABEL_JOINER_CHAR = "_";
+  private static final Splitter COMMA_SPLITTER = 
Splitter.on(',').omitEmptyStrings().trimResults();
+  private static volatile OpenTelemetryInstrumentation GLOBAL_INSTANCE;
+
+  private final Attributes commonAttributes;
+  private final Meter meter;
+  private final ConcurrentHashMap<String, OpenTelemetryMetric> metrics;
+
+  private OpenTelemetryInstrumentation(final State state) {
+    this.commonAttributes = buildCommonAttributes(state);
+    this.meter = getOpenTelemetryMetrics(state).getMeter(state.getProp(
+        ConfigurationKeys.METRICS_REPORTING_OPENTELEMETRY_GROUP_NAME,
+        ConfigurationKeys.DEFAULT_METRICS_REPORTING_OPENTELEMETRY_GROUP_NAME));
+    this.metrics = new ConcurrentHashMap<>();
+  }
+
+  private OpenTelemetryMetricsBase getOpenTelemetryMetrics(State state) {
+    try {
+      String openTelemetryClassName = 
state.getProp(ConfigurationKeys.METRICS_REPORTING_OPENTELEMETRY_CLASSNAME,
+          ConfigurationKeys.DEFAULT_METRICS_REPORTING_OPENTELEMETRY_CLASSNAME);
+      Class<?> metricsClass = Class.forName(openTelemetryClassName);
+      Method getInstanceMethod = metricsClass.getMethod("getInstance", 
State.class);
+      return (OpenTelemetryMetricsBase) getInstanceMethod.invoke(null, state);
+    } catch (Exception e) {
+      log.error("Failed to initialize OpenTelemetryMetrics through reflection, 
defaulting to direct instantiation of InMemoryOpenTelemetryMetrics", e);
+    }
+    return InMemoryOpenTelemetryMetrics.getInstance(state);
+  }
+
+  /**
+   * Returns the singleton instance for the given configuration state.
+   *
+   * @param state the configuration containing metric reporting and dimension 
configs
+   * @return the global {@link OpenTelemetryInstrumentation} instance
+   */
+  public static OpenTelemetryInstrumentation getInstance(final State state) {
+    if (GLOBAL_INSTANCE == null) {
+      synchronized (OpenTelemetryInstrumentation.class) {
+        if (GLOBAL_INSTANCE == null) {
+          log.info("Creating OpenTelemetryInstrumentation instance");
+          GLOBAL_INSTANCE = new OpenTelemetryInstrumentation(state);
+        }
+      }
+    }
+    return GLOBAL_INSTANCE;
+  }
+
+  public static OpenTelemetryInstrumentation getInstance(final Properties 
props) {
+    return getInstance(new State(props));
+  }
+
+  /**
+   * Retrieves an existing metric by its enum definition or creates it if 
absent.
+   *
+   * @param metric the {@link GaaSOpenTelemetryMetrics} enum defining name, 
description, unit, and type {@link OpenTelemetryMetricType}
+   * @return an {@link OpenTelemetryMetric} instance corresponding to the 
provided enum
+   */
+  public OpenTelemetryMetric getOrCreate(GaaSOpenTelemetryMetrics metric) {
+    return this.metrics.computeIfAbsent(metric.getMetricName(), name -> 
createMetric(metric));
+  }

Review Comment:
   `Two attributes, two metrics, or two events MUST NOT share the same name. 
Different entities (attribute and metric, metric and event) MAY share the same 
name.`
   
https://opentelemetry.io/docs/specs/semconv/general/naming/#name-reuse-prohibition
 





Issue Time Tracking
-------------------

    Worklog Id:     (was: 975403)
    Time Spent: 3h 10m  (was: 3h)

> Emit GaaS Executor OTel Metrics
> -------------------------------
>
>                 Key: GOBBLIN-2209
>                 URL: https://issues.apache.org/jira/browse/GOBBLIN-2209
>             Project: Apache Gobblin
>          Issue Type: Improvement
>          Components: gobblin-metrics
>            Reporter: Vivek Rai
>            Assignee: Issac Buenrostro
>            Priority: Major
>          Time Spent: 3h 10m
>  Remaining Estimate: 0h
>
> Emit GaaS Executor OTel Metrics



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