> NotifyEntryAdded never had any subscribers so can be removed.
>
> Since ConnectTrace no longer subscribes to NotifyEntryRemoved, there are
> now no subscribers.
>
> The CValidationInterface TransactionAddedToMempool and
> TransactionRemovedFromMempool methods can now provide this
> functionality. There's no need for a special notifications framework for
> the mempool.
This concludes backport of Core [[https://github.com/bitcoin/bitcoin/pull/17477 | PR17477]] [6/6]
https://github.com/bitcoin/bitcoin/pull/17477/commits/e57980b4738c10344baf136de3e050a3cb958ca5
Depends on D8868
Note: See D6451 for why `NotifyEntryRemoved` has to be removed twice. It was probably duplicated by mistake.