Slides for the online stream at https://www.youtube.com/live/JOEpIQL7cXM for Percona (https://percona.community/events/2025-03-sveta-toolkit/) MySQL 8.4 GA was released with dropped offensive replication statements, such as START/STOP SLAVE. As a maintainer of the Percona Toolkit: a set of tools, originally written in the early days of MySQL when nobody was even thinking that these statements would change, - I had to rewrite all tools and libraries that use replication statements. This ended up with a huge changeset for 511 files in the toolkit. This stream covers the resolved and not yet resolved challenges that I have met when renewing legacy code.