diff --git a/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_metric_attribute_generator.py b/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_metric_attribute_generator.py
index f945254fb..060d902a0 100644
--- a/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_metric_attribute_generator.py
+++ b/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/_aws_metric_attribute_generator.py
@@ -453,10 +453,12 @@ def _escape_delimiters(input_str: str) -> Optional[str]:
         return None
     return input_str.replace("^", "^^").replace("|", "^|")
 
+
 def _set_remote_db_user(span: ReadableSpan, attributes: BoundedAttributes) -> None:
     if is_db_span(span) and is_key_present(span, _DB_USER):
         attributes[AWS_REMOTE_DB_USER] = span.attributes.get(_DB_USER)
 
+
 def _set_span_kind_for_dependency(span: ReadableSpan, attributes: BoundedAttributes) -> None:
     span_kind: str = span.kind.name
     attributes[AWS_SPAN_KIND] = span_kind
diff --git a/aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_metric_attribute_generator.py b/aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_metric_attribute_generator.py
index d15f6f34d..11845522f 100644
--- a/aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_metric_attribute_generator.py
+++ b/aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_metric_attribute_generator.py
@@ -13,13 +13,13 @@
     AWS_LOCAL_SERVICE,
     AWS_QUEUE_NAME,
     AWS_QUEUE_URL,
+    AWS_REMOTE_DB_USER,
     AWS_REMOTE_OPERATION,
     AWS_REMOTE_RESOURCE_IDENTIFIER,
     AWS_REMOTE_RESOURCE_TYPE,
     AWS_REMOTE_SERVICE,
     AWS_SPAN_KIND,
     AWS_STREAM_NAME,
-    AWS_REMOTE_DB_USER,
 )
 from amazon.opentelemetry.distro._aws_metric_attribute_generator import _AwsMetricAttributeGenerator
 from amazon.opentelemetry.distro.metric_attribute_generator import DEPENDENCY_METRIC, SERVICE_METRIC
@@ -788,7 +788,7 @@ def test_db_user_attribute_absent(self):
         self._mock_attribute(SpanAttributes.DB_USER, None)
         self.span_mock.kind = SpanKind.CLIENT
 
-        actual_attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
             self.span_mock, self.resource
         ).get(DEPENDENCY_METRIC)
         self.assertIsNone(actual_attributes.get(AWS_REMOTE_DB_USER))
@@ -798,7 +798,7 @@ def test_db_user_attribute_not_present_in_service_metric_for_server_span(self):
         self._mock_attribute([SpanAttributes.DB_USER], [db_user])
         self.span_mock.kind = SpanKind.SERVER
 
-        actual_attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
             self.span_mock, self.resource
         ).get(SERVICE_METRIC)
         self.assertIsNone(actual_attributes.get(AWS_REMOTE_DB_USER))
@@ -808,7 +808,7 @@ def test_db_user_attribute_with_different_values(self):
         self._mock_attribute([SpanAttributes.DB_USER], [db_user])
         self.span_mock.kind = SpanKind.CLIENT
 
-        actual_attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
+        actual_attributes: Attributes = _GENERATOR.generate_metric_attributes_dict_from_span(
             self.span_mock, self.resource
         ).get(DEPENDENCY_METRIC)
         self.assertEqual(actual_attributes.get(AWS_REMOTE_DB_USER), db_user)
diff --git a/contract-tests/tests/test/amazon/base/database_contract_test_base.py b/contract-tests/tests/test/amazon/base/database_contract_test_base.py
index f5380622f..0a4c44580 100644
--- a/contract-tests/tests/test/amazon/base/database_contract_test_base.py
+++ b/contract-tests/tests/test/amazon/base/database_contract_test_base.py
@@ -27,6 +27,7 @@
 DATABASE_NAME: str = "testdb"
 DB_USER: str = "db.user"
 
+
 class DatabaseContractTestBase(ContractTestBase):
     @staticmethod
     def get_remote_service() -> str: