It really depends on where messages come from. If you want to check everything then I'd start with application configuration files and command line arguments (logging, verbosity, syslog, debug settings), then (r)syslog(-ng) settings that log facility.priority to "*" or specific TTYs and then personal settings. Stray messages on the console usually point to missing a 'dmesg -n [value]' setting in ones personal shell resources.
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