Function set_collection_metadata 

pub fn set_collection_metadata<T: Config>(
    collection: CollectionId,
    key: MetadataKeyOf<T>,
    value: Option<MetadataValueOf<T>>,
)

Set or remove a collection-level metadata default.

Only the collection owner may mutate metadata. None releases an existing entry’s deposit; when the key is absent it is a successful no-op.

Warning: Doc-Only

This function is an automatically generated, and is doc-only, uncallable stub. See the real version in Pallet::set_collection_metadata.