( The OP is no longer what it was when I replied. The code snippet was changed, and a second code snippet was added. )
There are no syntax errors.
>perl -c script.pl
script.pl syntax OK
But that doesn't mean it does what you want it to do.
@logging='find . -name cynlogging.properties';
@logging=`find . -name cynlogging.properties`;
And you need to remove the newlines returned by find by adding
Finally, you never write your changes to the file.
Update: Missed one.
Your inner loop modifies $prop repeatedly, but the loop variable is the default $_.
$prop =~ s/DEBUG_MIN/WARN/g;
$_ =~ s/DEBUG_MIN/WARN/g;
which is the same as just
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