Hello Stephen,
Our customers have the same request. What comes to my mind is:
- interface Health Points (Device Status, Heartbeat, I/O Rate)
- AF analyses to check for staleness, out-of-range and/or Bad quality data
(see for example PI World Lab 2019: "Managing Time Series Data Quality for Business Data Owners and PI Administrators")
Is there anything else we could do to help customers identify issues with data quality?