When I go (in the web interface) to the main Jenkins configuration page, a stack trace is generated on the Jenkins console. No adverse results appear on the web page itself. From the stack track, it looks like it is connected to the warnings plugin.
This is Jenkins 1.446 and Warnings plugin 3.26 (the latest available at the time of reporting). I have been noticing this stack track for some time now, including under earlier releases (I'm not sure how recently it started).
The stack trace: