Not sure if i am in the right place since i am not used to github.
I would like to suggest AMXX 1.9 as the official version with the signatures fixed for the latest cs version. Most users already use this version but with outdated signatures while they run servers with legacy.
Why is this a must?
Some servers fail to set legacy version on server start-up and it requires a map change to fix it. Plugins that use hamsandwich will not work on start-up because legacy was not loaded and the signatures are outdated. This is an issue and we must fix it.
The signatures for the latest version are all here: #1086 posted by ClaudiuHKS.