Constant LATEST_PRODUCTION_METADATA_VERSION 

pub const LATEST_PRODUCTION_METADATA_VERSION: i16 = krabka_raft::LATEST_PRODUCTION_METADATA_VERSION; // 30i16

The metadata.version a cluster formats at when neither --release-version nor --feature metadata.version names one: Kafka 4.3’s MetadataVersion.LATEST_PRODUCTION, 4.3-IV0.

The levels above it that the feature table carries, 4.4-IV0 to 4.5-IV0, are Kafka trunk’s unstable versions. A stock 4.3 node or tool does not know them, so a format names one only under --unstable-feature-versions-enable, Kafka’s unstable.feature.versions.enable.