pub const DELTA_PARENT_DIGEST_KEY: &str = "ringkernel.delta.parent_digest";Expand description
Metadata custom key that records a delta checkpoint’s parent.
A checkpoint produced via Checkpoint::delta_from sets this key to
the string returned by Checkpoint::content_digest of the base
checkpoint it was diffed against. Checkpoint::applied_with_delta
(and anyone reading the delta) can use it to validate the delta is
being applied on top of the correct base.