Well, it has been a solid day watching these nagging log entries scroll by over and over again.
I just cleared up a cacti issue on Pi1 by determining that I was not actually using cacti for anything and removing it, along with the CRON job that was generating the log entry.
On Pi3, I did the same for MRTG, which I am not actually using.
The one biggie that remains to be cleaned up is 1wire error message about my temperature and humidity sensor being missing. I need to fix up the bad solder joint (mine) on there and get this installed ASAP. I am using the log message as a constant reminder.
So far, I am loving this thing!