Add cloud.account.id attribute by AwsLambdaInstrumentor

instrumentation/opentelemetry-instrumentation-aws-lambda/src/opentelemetry/instrumentation/aws_lambda/__init__.py

@@ -354,6 +354,16 @@ def _instrumented_lambda_handler_call(  # noqa pylint: disable=too-many-branches
                     lambda_context.aws_request_id,
                 )
 
+                # NOTE: `cloud.account.id` can be parsed from the ARN as the fifth item when splitting on `:`
+                #
+                # See more:
+                # https://github.com/open-telemetry/semantic-conventions/blob/main/docs/faas/aws-lambda.md#all-triggers
+                account_id = lambda_context.invoked_function_arn.split(":")[4]
+                span.set_attribute(
+                    ResourceAttributes.CLOUD_ACCOUNT_ID,
+                    account_id,
+                )
+
             exception = None
             try:
                 result = call_wrapped(*args, **kwargs)

instrumentation/opentelemetry-instrumentation-aws-lambda/tests/test_aws_lambda_instrumentation_manual.py

@@ -147,6 +147,7 @@ def test_active_tracing(self):
             {
                 ResourceAttributes.FAAS_ID: MOCK_LAMBDA_CONTEXT.invoked_function_arn,
                 SpanAttributes.FAAS_EXECUTION: MOCK_LAMBDA_CONTEXT.aws_request_id,
+                ResourceAttributes.CLOUD_ACCOUNT_ID: MOCK_LAMBDA_CONTEXT.invoked_function_arn.split(":")[4],
             },
         )