code: def upgrade_metadata_v2_to_v3():
      return [
          drop(
              [
                  "deployed_on",
                  "on_board",
                  "signup_enabled",
                  "admin_email",
              ]
          )
      ]
  
file_path: PySyft/packages/syft/src/syft/service/metadata/migrations.py
imports: from typing import Callable
  from ...types.syft_migration import migrate
  from ...types.transforms import TransformContext
  from ...types.transforms import drop
  from ...types.transforms import rename
  from .node_metadata import NodeMetadata
  from .node_metadata import NodeMetadataV2
  from .node_metadata import NodeMetadataV3
label_desc: Use image node_id 3 for calling a global function with example usage: upgrade_metadata_v2_to_v3() and returns: list