What you need is well-architected logging: Log statements in your code and a logging package like
Log::Log4perl providing a "remote-control," which allows you to turn on previously inactive logging statements, increase or decrease their verbosity independently in different parts of the system, or turn them back off entirely. Certainly without touching your system's code -- and even without restarting it.
That's a quote from the perl.comarticle about Log::Log4Perl.
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