Stats on orphanage overflows

[glozow]

Thanks as always for the awesome stats!

@0xB10C

I found >10M removals on, for example, 2024-09-14 across all nodes to be surprising. Looking at data from node alice on 2024-09-14 shows that we’re sometimes removing more than 100k orphans per minute. This feels like someone flooding us with orphans.

@0xB10C

edit3: In total, the node requested about 200k unique txids with Requesting tx that day. It seems like it forgot about the orphans and re-requested them multiple times.

fwiw, this is good motivation for increasing the capacity + making it more difficult for any one peer to churn orphanage: https://github.com/bitcoin/bitcoin/pull/31829