How to suppress "page not found" messages in watchdog The issue Add an option to suppress page not found watchdog messages at https://www.drupal.org/node/2836458 indicates that a setting was added to Drupal 8 to suppress page not found errors in watchdog. I can't find the setting in the interface. Am I mistaken in understanding that it was added? If not, where do I find this setting? Running Drupal 8.8.1.
Yes that option is available as described in the linked issue.

Make sure you have the Redirect 404 module enabled, visit /admin/config/search/redirect/settings, and select the Suppress 'page not found' log messages option.



That will stop 404s being logged.