old_contents: from .tag import TagSerializer
  from .user import UserSerializer
  from .project import ProjectSerializer
  from .instance import InstanceSerializer, InstanceSummarySerializer
  from .volume import VolumeSerializer, VolumeSummarySerializer
  from .image import ImageSerializer, ImageSummarySerializer, ImageBookmarkSerializer
  from .provider import ProviderSerializer, ProviderSummarySerializer, ProviderTypeSerializer, PlatformTypeSerializer
  from .identity import IdentitySerializer, IdentitySummarySerializer
  from .quota import QuotaSerializer
  from .allocation import AllocationSerializer
  from .provider_machine import ProviderMachineSerializer, ProviderMachineSummarySerializer
  from .size import SizeSerializer, SizeSummarySerializer
  
new_contents: from .allocation import AllocationSerializer
  from .identity import IdentitySerializer, IdentitySummarySerializer
  from .image import ImageSerializer, ImageSummarySerializer, ImageBookmarkSerializer
  from .instance import InstanceSerializer, InstanceSummarySerializer
  from .project import ProjectSerializer
  from .provider import ProviderSerializer, ProviderSummarySerializer, ProviderTypeSerializer, PlatformTypeSerializer
  from .provider_machine import ProviderMachineSerializer, ProviderMachineSummarySerializer
  from .quota import QuotaSerializer
  from .size import SizeSerializer, SizeSummarySerializer
  from .tag import TagSerializer
  from .user import UserSerializer
  from .volume import VolumeSerializer, VolumeSummarySerializer
  
subject: arrange serializers alphabetically