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.
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Thanks, @Clive. I don't see the Redirect 404 module as being available for Drupal 8. Am I missing something there? Ah! I see it's in core. I'l try it out and report. – Marshall Morrise Jan 20 at 17:10
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Oh right, it’s part of the normal redirect module (as a submodule) in D8 @Marshall – Clive♦ Jan 20 at 18:05
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Worked perfectly! Thanks again, @Clive. Enabling 404 Redirect was it. It's always the one little thing I miss that catches me. – Marshall Morrise Jan 20 at 19:34
