Closes #17143: Deprecate the use of dedicated nested API serializers

netbox/vpn/api/nested_serializers.py

@@ -1,5 +1,6 @@
+import warnings
+
 from drf_spectacular.utils import extend_schema_serializer
-from rest_framework import serializers
 
 from netbox.api.fields import RelatedObjectCountField
 from netbox.api.serializers import WritableNestedSerializer
@@ -18,6 +19,12 @@ __all__ = (
     'NestedTunnelTerminationSerializer',
 )
 
+# TODO: Remove in v4.2
+warnings.warn(
+    f"Dedicated nested serializers will be removed in NetBox v4.2. Use Serializer(nested=True) instead.",
+    DeprecationWarning
+)
+
 
 @extend_schema_serializer(
     exclude_fields=('tunnel_count',),

netbox/vpn/api/serializers.py

@@ -1,4 +1,3 @@
 from .serializers_.crypto import *
 from .serializers_.tunnels import *
 from .serializers_.l2vpn import *
-from .nested_serializers import *