:~$ /usr/lib/nagios/plugins/check_haproxy --help
Redundant argument in sprintf at /usr/share/perl5/Nagios/Plugin/Getopt.pm line 144.
Redundant argument in sprintf at /usr/share/perl5/Nagios/Plugin/Getopt.pm line 144.
check_haproxy 1.0

This nagios plugin is free software, and comes with ABSOLUTELY NO WARRANTY.
It may be used, redistributed and/or modified under the terms of the GNU
General Public Licence (see http://www.fsf.org/licensing/licenses/gpl.txt).

Plugin to check HAProxy stats url

Usage: check_haproxy [ -v|--verbose ]  -u <url> [-t <timeout>] [-U <username>] [-P <password>] [ -c|--critical=<threshold> ] [ -w|--warning=<threshold> ]

 -?, --usage
   Print usage information
 -h, --help
   Print detailed help screen
 -V, --version
   Print version information
 --extra-opts=[section][@file]
   Read options from an ini file. See http://nagiosplugins.org/extra-opts
   for usage and examples.
 -d, --debug
   Debug level
 -U, --username=STRING
   Username for HTTP Auth
 -P, --password=STRING
   Password for HTTP Auth
 -w=FLOAT
   Warning request time threshold (in seconds)
 -c=FLOAT
   Critical request time threshold (in seconds)
 -u, --url=STRING
   URL of the HAProxy csv statistics page.
 -t, --timeout=INTEGER
   Seconds before plugin times out (default: 10)
 -v, --verbose
   Show details for command-line debugging (can repeat up to 3 times)