On the Topics page, label deprecated PI programs and features as such
This should help remind users that they should not be using these programs and features. Appending "(deprecated)" to the end of these topics should suffice.
The topics for deprecated PI programs and features are:
• Performance Equations
• PI ACE
• PI ProcessBook
Kenneth Barber commented
I should also mention that PI ACE and PI ProcessBook have official end-of-support dates: