message FeatureSet {
    // User-specified specifications of this feature set.
    FeatureSetSpec spec = 1;

    // System-populated metadata for this feature set.
    FeatureSetMeta metadata = 2;
}

message FeatureSetSpec {
    // same
}

message FeatureSetMeta {
    // Created timestamp of this specific feature set.
    google.protobuf.Timestamp created_timestamp = 1;

    // Status of the feature set.
    // Used to indicate whether the feature set is ready for consumption or ingestion.
    // Currently supports 2 states:
    // 1) PENDING - A feature set is in pending state if Feast has not spun up the jobs
    // necessary to push rows for this feature set to stores subscribing to this feature set.
    // 2) READY - Feature set is ready for consumption or ingestion
    string status = 2;

    // .. project, etc
}