diff --git a/google/cloud/bigquery_v2/types/model.py b/google/cloud/bigquery_v2/types/model.py
index 6e3ca0095..a56b21491 100644
--- a/google/cloud/bigquery_v2/types/model.py
+++ b/google/cloud/bigquery_v2/types/model.py
@@ -560,14 +560,23 @@ class Cluster(proto.Message):
             class FeatureValue(proto.Message):
                 r"""Representative value of a single feature within the cluster.
 
+                This message has `oneof`_ fields (mutually exclusive fields).
+                For each oneof, at most one member field can be set at the same time.
+                Setting any member of the oneof automatically clears all other
+                members.
+
+                .. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields
+
                 Attributes:
                     feature_column (str):
                         The feature column name.
                     numerical_value (google.protobuf.wrappers_pb2.DoubleValue):
                         The numerical feature value. This is the
                         centroid value for this feature.
+                        This field is a member of `oneof`_ ``value``.
                     categorical_value (google.cloud.bigquery_v2.types.Model.ClusteringMetrics.Cluster.FeatureValue.CategoricalValue):
                         The categorical feature value.
+                        This field is a member of `oneof`_ ``value``.
                 """
 
                 class CategoricalValue(proto.Message):
@@ -784,23 +793,36 @@ class EvaluationMetrics(proto.Message):
         data was used during training. These are not present for
         imported models.
 
+        This message has `oneof`_ fields (mutually exclusive fields).
+        For each oneof, at most one member field can be set at the same time.
+        Setting any member of the oneof automatically clears all other
+        members.
+
+        .. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields
+
         Attributes:
             regression_metrics (google.cloud.bigquery_v2.types.Model.RegressionMetrics):
                 Populated for regression models and explicit
                 feedback type matrix factorization models.
+                This field is a member of `oneof`_ ``metrics``.
             binary_classification_metrics (google.cloud.bigquery_v2.types.Model.BinaryClassificationMetrics):
                 Populated for binary
                 classification/classifier models.
+                This field is a member of `oneof`_ ``metrics``.
             multi_class_classification_metrics (google.cloud.bigquery_v2.types.Model.MultiClassClassificationMetrics):
                 Populated for multi-class
                 classification/classifier models.
+                This field is a member of `oneof`_ ``metrics``.
             clustering_metrics (google.cloud.bigquery_v2.types.Model.ClusteringMetrics):
                 Populated for clustering models.
+                This field is a member of `oneof`_ ``metrics``.
             ranking_metrics (google.cloud.bigquery_v2.types.Model.RankingMetrics):
                 Populated for implicit feedback type matrix
                 factorization models.
+                This field is a member of `oneof`_ ``metrics``.
             arima_forecasting_metrics (google.cloud.bigquery_v2.types.Model.ArimaForecastingMetrics):
                 Populated for ARIMA models.
+                This field is a member of `oneof`_ ``metrics``.
         """
 
         regression_metrics = proto.Field(
diff --git a/google/cloud/bigquery_v2/types/standard_sql.py b/google/cloud/bigquery_v2/types/standard_sql.py
index 69a221c3c..d6c133634 100644
--- a/google/cloud/bigquery_v2/types/standard_sql.py
+++ b/google/cloud/bigquery_v2/types/standard_sql.py
@@ -35,6 +35,13 @@ class StandardSqlDataType(proto.Message):
     type={type_kind="STRING"}}, {name="y", type={type_kind="ARRAY",
     array_element_type="DATE"}} ]}}
 
+    This message has `oneof`_ fields (mutually exclusive fields).
+    For each oneof, at most one member field can be set at the same time.
+    Setting any member of the oneof automatically clears all other
+    members.
+
+    .. _oneof: https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields
+
     Attributes:
         type_kind (google.cloud.bigquery_v2.types.StandardSqlDataType.TypeKind):
             Required. The top level type of this field.
@@ -42,9 +49,11 @@ class StandardSqlDataType(proto.Message):
             "INT64", "DATE", "ARRAY").
         array_element_type (google.cloud.bigquery_v2.types.StandardSqlDataType):
             The type of the array's elements, if type_kind = "ARRAY".
+            This field is a member of `oneof`_ ``sub_type``.
         struct_type (google.cloud.bigquery_v2.types.StandardSqlStructType):
             The fields of this struct, in order, if type_kind =
             "STRUCT".
+            This field is a member of `oneof`_ ``sub_type``.
     """
 
     class TypeKind(proto.Enum):
diff --git a/samples/magics/noxfile.py b/samples/magics/noxfile.py
index b008613f0..93a9122cc 100644
--- a/samples/magics/noxfile.py
+++ b/samples/magics/noxfile.py
@@ -87,7 +87,7 @@ def get_pytest_env_vars() -> Dict[str, str]:
 
 # DO NOT EDIT - automatically generated.
 # All versions used to test samples.
-ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9"]
+ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG["ignored_versions"]
@@ -98,6 +98,10 @@ def get_pytest_env_vars() -> Dict[str, str]:
     "True",
     "true",
 )
+
+# Error if a python version is missing
+nox.options.error_on_missing_interpreters = True
+
 #
 # Style Checks
 #