There used to be lot of best practice documents in previous version (6.x / 7.x /8.x) and various old OS (Windows 2013, System z Linux, etc). Such example would be :
IBM Lotus Domino 8.5 server performance
Notes/Domino Best Practices: Master Checklist (https://www.ibm.com/support/pages/notesdomino-best-practices-master-checklist)
Many times customers have asked for updated versions of those documents, so any update would certainly be appreciated.
Tinus Riyanto - Prisma Global Solusi