Undocumented infrastructure is a liability that compounds. The person who “just knows how it works” is a single point of failure. The vendor who left no as-built is an unbudgeted future project.
What an as-built must contain
- Identity providers and major application dependencies.
- Network segments and the purpose of each.
- Where compute and data actually live.
- Backup targets and the last restore test.
- Who is allowed to change what.
MHM treats the diagram as a deliverable, not an internal sketch. If the environment cannot be shown, it cannot be handed over, audited, or improved with confidence.