Type Alias GroupMetadata 

pub type GroupMetadata = BTreeMap<String, Value>;

Schema-free saved-model metadata keyed by stable group id.

The values are JSON rather than a typed enum because group provenance is supplied by caller-owned catalogs. FittedModelPayload::group_metadata wraps this in Option with #[serde(default)], so model files written before the field existed deserialize as None.

Aliased Type

pub struct GroupMetadata { /* private fields */ }