Documentation succeeds when it becomes part of daily operations, not a separate task people avoid.
Integration strategies:
Automate what you can. Config backups, IP tracking, and change logging should happen automatically.
Link systems together. IPAM should link to diagrams. Monitoring should link to runbooks.
Review regularly. Schedule quarterly documentation audits.
Update during changes. Every change ticket should include "update documentation."
Make it findable. A wiki with good search beats scattered files.
Start small. Pick your most painful gap and build from there.