This is Perl module Sub::Retry.
INSTALLATION
Sub::Retry installation is straightforward. If your CPAN shell is set up,
you should just be able to do
% cpan Sub::Retry
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
Sub::Retry documentation is available as in POD. So you can do:
% perldoc Sub::Retry