rust-lightning/pending_changelog/3322-a.txt

API Changes
===========

Additional information is now stored in `ChannelMonitorUpdate`s which may increase the size of
`ChannelMonitorUpdate`s claiming inbound payments substantially. The expected maximum size of
`ChannelMonitorUpdate`s shouldn't change materially.
Pass info about claimed payments, incl HTLCs to `ChannelMonitor`s When we claim an MPP payment, then crash before persisting all the relevant `ChannelMonitor`s, we rely on the payment data being available in the `ChannelManager` on restart to re-claim any parts that haven't yet been claimed. This is fine as long as the `ChannelManager` was persisted before the `PaymentClaimable` event was processed, which is generally the case in our `lightning-background-processor`, but may not be in other cases or in a somewhat rare race. In order to fix this, we need to track where all the MPP parts of a payment are in the `ChannelMonitor`, allowing us to re-claim any missing pieces without reference to any `ChannelManager` data. Further, in order to properly generate a `PaymentClaimed` event against the re-started claim, we have to store various payment metadata with the HTLC list as well. Here we take the first step, building a list of MPP parts and metadata in `ChannelManager` and passing it through to `ChannelMonitor` in the `ChannelMonitorUpdate`s. 2024-09-15 23:50:31 +00:00			`API Changes`
			`===========`

			Additional information is now stored in `ChannelMonitorUpdate`s which may increase the size of
			`ChannelMonitorUpdate`s claiming inbound payments substantially. The expected maximum size of
			`ChannelMonitorUpdate`s shouldn't change materially.