def instance_system_metadata_update(context, instance_uuid, metadata, delete):
    IMPL.instance_system_metadata_update(
            context, instance_uuid, metadata, delete)


####################
Update metadata if it exists, otherwise create it.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/instance_system_metadata_update