Parses the scrape statistics from opentracker.
Args: $self, $payload
Decodes the plain text data retrieved from the scrape statistics of opentracker.
The payload looks like this (no indentation): 19 0 33275 seconds (9 hours) opentracker scrape stats, 1 scrape/s (tcp and udp)
Knut-Olav Hoven, <firstname.lastname@example.org>
Copyright (C) 2009 by Knut-Olav Hoven
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.