zcashd/doc/release-notes.md

(note: this is a temporary file, to be added-to by anybody, and moved to release-notes at release time)

Notable changes

Wallet Performance Improvements

zcashd 5.2.0 improved the performance of wallet scanning with multithreaded batched trial decryption of Sapling outputs. However, for some nodes this resulted in growing memory usage that would eventually cause an OOM abort. The batch scanner now has a memory limit of 100 MiB.

zcashd now reports the following new metrics when -prometheusport is set:

• (counter) zcashd.wallet.batchscanner.outputs.scanned
• (gauge) zcashd.wallet.batchscanner.size.transactions
• (gauge) zcashd.wallet.batchscanner.usage.bytes