feat(detector-aws): add attributes to aws lambda detector

Author: garysassano

detectors/node/opentelemetry-resource-detector-aws/src/detectors/AwsLambdaDetectorSync.ts

@@ -22,43 +22,62 @@ import {
   ResourceDetectionConfig,
 } from '@opentelemetry/resources';
 import {
+  // AWS attributes
+  ATTR_AWS_LOG_GROUP_NAMES,
+  // Cloud attributes
   ATTR_CLOUD_PROVIDER,
   ATTR_CLOUD_PLATFORM,
   ATTR_CLOUD_REGION,
-  ATTR_FAAS_VERSION,
-  ATTR_FAAS_NAME,
+  // Cloud values (AWS)
   CLOUD_PROVIDER_VALUE_AWS,
   CLOUD_PLATFORM_VALUE_AWS_LAMBDA,
+  // FaaS attributes
+  ATTR_FAAS_NAME,
+  ATTR_FAAS_VERSION,
+  ATTR_FAAS_INSTANCE,
+  ATTR_FAAS_MAX_MEMORY,
 } from '@opentelemetry/semantic-conventions/incubating';
 
 /**
  * The AwsLambdaDetector can be used to detect if a process is running in AWS Lambda
  * and return a {@link Resource} populated with data about the environment.
  * Returns an empty Resource if detection fails.
+ * 
+ * AWS Lambda documentation for available environment variables within the Lambda runtimes.
+ * @see https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html#configuration-envvars-runtime
  */
 export class AwsLambdaDetectorSync implements DetectorSync {
   detect(_config?: ResourceDetectionConfig): IResource {
-    const functionName = process.env.AWS_LAMBDA_FUNCTION_NAME;
-    if (!functionName) {
+    // Check if running inside AWS Lambda environment, return early if not
+    const executionEnv = process.env.AWS_EXECUTION_ENV;
+    if (!executionEnv?.startsWith('AWS_Lambda_')) {
       return Resource.empty();
     }
 
-    const functionVersion = process.env.AWS_LAMBDA_FUNCTION_VERSION;
-    const region = process.env.AWS_REGION;
+    // These environment variables are guaranteed to be present in AWS Lambda
+    const region = process.env.AWS_REGION!;
+    const functionName = process.env.AWS_LAMBDA_FUNCTION_NAME!;
+    const functionVersion = process.env.AWS_LAMBDA_FUNCTION_VERSION!;
+    const memorySize = process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE!;
 
     const attributes: ResourceAttributes = {
-      [ATTR_CLOUD_PROVIDER]: String(CLOUD_PROVIDER_VALUE_AWS),
-      [ATTR_CLOUD_PLATFORM]: String(CLOUD_PLATFORM_VALUE_AWS_LAMBDA),
+      [ATTR_CLOUD_PROVIDER]: CLOUD_PROVIDER_VALUE_AWS,
+      [ATTR_CLOUD_PLATFORM]: CLOUD_PLATFORM_VALUE_AWS_LAMBDA,
+      [ATTR_FAAS_NAME]: functionName,
+      [ATTR_CLOUD_REGION]: region,
+      [ATTR_FAAS_VERSION]: functionVersion,
+      [ATTR_FAAS_MAX_MEMORY]: parseInt(memorySize) * 1024 * 1024,
     };
-    if (region) {
-      attributes[ATTR_CLOUD_REGION] = region;
-    }
 
-    if (functionName) {
-      attributes[ATTR_FAAS_NAME] = functionName;
+    // These environment variables are not available in Lambda SnapStart
+    const logGroupName = process.env.AWS_LAMBDA_LOG_GROUP_NAME;
+    const logStreamName = process.env.AWS_LAMBDA_LOG_STREAM_NAME;
+    
+    if (logStreamName) {
+      attributes[ATTR_FAAS_INSTANCE] = logStreamName;
     }
-    if (functionVersion) {
-      attributes[ATTR_FAAS_VERSION] = functionVersion;
+    if (logGroupName) {
+      attributes[ATTR_AWS_LOG_GROUP_NAMES] = [logGroupName];
     }
 
     return new Resource(attributes);

detectors/node/opentelemetry-resource-detector-aws/test/detectors/AwsLambdaDetectorSync.test.ts

@@ -16,9 +16,20 @@
 
 import * as assert from 'assert';
 import {
-  assertCloudResource,
   assertEmptyResource,
 } from '@opentelemetry/contrib-test-utils';
+import {
+  ATTR_CLOUD_PROVIDER,
+  ATTR_CLOUD_PLATFORM,
+  ATTR_CLOUD_REGION,
+  ATTR_FAAS_NAME,
+  ATTR_FAAS_VERSION,
+  ATTR_FAAS_INSTANCE,
+  ATTR_FAAS_MAX_MEMORY,
+  ATTR_AWS_LOG_GROUP_NAMES,
+  CLOUD_PROVIDER_VALUE_AWS,
+  CLOUD_PLATFORM_VALUE_AWS_LAMBDA,
+} from '@opentelemetry/semantic-conventions/incubating';
 
 import { awsLambdaDetectorSync } from '../../src';
 
@@ -35,25 +46,40 @@ describe('awsLambdaDetectorSync', () => {
 
   describe('on lambda', () => {
     it('fills resource', async () => {
+      process.env.AWS_EXECUTION_ENV = 'AWS_Lambda_nodejs22.x';
+      process.env.AWS_REGION = 'us-east-1';
       process.env.AWS_LAMBDA_FUNCTION_NAME = 'name';
       process.env.AWS_LAMBDA_FUNCTION_VERSION = 'v1';
-      process.env.AWS_REGION = 'us-east-1';
+      process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE = '128';
+      process.env.AWS_LAMBDA_LOG_GROUP_NAME = '/aws/lambda/name';
+      process.env.AWS_LAMBDA_LOG_STREAM_NAME = '2024/03/14/[$LATEST]123456';
 
       const resource = awsLambdaDetectorSync.detect();
 
-      assertCloudResource(resource, {
-        provider: 'aws',
-        region: 'us-east-1',
-      });
-
-      assert.strictEqual(resource.attributes['faas.name'], 'name');
-      assert.strictEqual(resource.attributes['faas.version'], 'v1');
+      assert.strictEqual(resource.attributes[ATTR_CLOUD_PROVIDER], CLOUD_PROVIDER_VALUE_AWS);
+      assert.strictEqual(resource.attributes[ATTR_CLOUD_PLATFORM], CLOUD_PLATFORM_VALUE_AWS_LAMBDA);
+      assert.strictEqual(resource.attributes[ATTR_CLOUD_REGION], 'us-east-1');
+      assert.strictEqual(resource.attributes[ATTR_FAAS_NAME], 'name');
+      assert.strictEqual(resource.attributes[ATTR_FAAS_VERSION], 'v1');
+      assert.strictEqual(resource.attributes[ATTR_FAAS_INSTANCE], '2024/03/14/[$LATEST]123456');
+      assert.strictEqual(resource.attributes[ATTR_FAAS_MAX_MEMORY], 128 * 1024 * 1024);
+      assert.deepStrictEqual(resource.attributes[ATTR_AWS_LOG_GROUP_NAMES], ['/aws/lambda/name']);
     });
   });
 
   describe('not on lambda', () => {
-    it('returns empty resource', async () => {
-      process.env.AWS_LAMBDA_FUNCTION_VERSION = 'v1';
+    it('returns empty resource if AWS_EXECUTION_ENV is not set', async () => {
+      process.env.AWS_LAMBDA_FUNCTION_NAME = 'name';
+      process.env.AWS_REGION = 'us-east-1';
+
+      const resource = awsLambdaDetectorSync.detect();
+
+      assertEmptyResource(resource);
+    });
+
+    it('returns empty resource if AWS_EXECUTION_ENV is not Lambda', async () => {
+      process.env.AWS_EXECUTION_ENV = 'AWS_EC2';
+      process.env.AWS_LAMBDA_FUNCTION_NAME = 'name';
       process.env.AWS_REGION = 'us-east-1';
 
       const resource = awsLambdaDetectorSync.detect();