def aggregate_metadata_add(context, aggregate_id, metadata, set_delete=False):
    IMPL.aggregate_metadata_add(context, aggregate_id, metadata, set_delete)
Add/update metadata. If set_delete=True, it adds only.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/db/api.py/aggregate_metadata_add