fix(opentelemetry-resource-detector-aws): add missing attribute to la… (open-telemetry#810)

Author: anupamdalmia10

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

@@ -21,6 +21,7 @@ import {
 } from '@opentelemetry/resources';
 import {
   CloudProviderValues,
+  CloudPlatformValues,
   SemanticResourceAttributes,
 } from '@opentelemetry/semantic-conventions';
 
@@ -43,6 +44,9 @@ export class AwsLambdaDetector implements Detector {
       [SemanticResourceAttributes.CLOUD_PROVIDER]: String(
         CloudProviderValues.AWS
       ),
+      [SemanticResourceAttributes.CLOUD_PLATFORM]: String(
+        CloudPlatformValues.AWS_LAMBDA
+      ),
     };
     if (region) {
       attributes[SemanticResourceAttributes.CLOUD_REGION] = region;