pub const METADATA_DOWNGRADE_CAPABILITY_FEATURE: &str = "krabka.metadata.downgrade";Expand description
Krabka registration-only marker for KIP-1155 downgrade support.
The KIP is still under discussion and has not assigned its promised
capability metadata.version level, so this must not extend the canonical
metadata-version range or appear in ApiVersions. It is carried only in
broker/controller registration feature maps; pre-KIP JVM nodes omit it.