You mentioned “feeds” and “temperatures.” Are these two different values? And deviation relative to what?
For example, are you saying, after the process has been running for 10 minutes, and the temperature has gone above 50 degrees, the newest reading should not be > +5% more than (?? the previous read a minute ago?) or less than (?? previous read? 50? some “known normal?”).
We have examples elsewhere on how to record data and/or send via email, but I’m trying to understand exactly what you need to compare/record.