Withdraw or replace a notice
What It Does
A producer or system caller withdraws notification work, or a later accepted occurrence replaces it.
The Flow
When Something Fails
The hop rows identify each retry boundary, any state left behind and the available observer. Settled requests are skipped, and cancellation tombstones persist under their derived identity; later publications are not retroactively cancelled. Conditional settlement coordinates reconciliation with withdrawal; an already claimed send can still complete.
Open Design Questions
Occurrence replacement withdraws prior work within acceptance. Definition retirement closes requests without the same notice-withdrawal steps. An accepted request remains withdrawable until settlement after expiry.