pub const HEALTH_CHECK_NONCE_HINT_KEY: &str = "nonce_hint";Expand description
Optional metadata key carrying a nonce hint for the health action.
When present, resolve_nonce_gaps ensures the counter covers at least hint + 1
so the scan range includes the hinted nonce. This handles the case where the
counter was reset (e.g., after a restart) but a tx at a higher nonce still exists.