data-sets is available in the B<types.db> file. See L<types.db(5)> for a
description of the format of this file.
-The I<OptionList> is an optional list of I<Options>, where each option if a
+The I<OptionList> is an optional list of I<Options>, where each option is a
key-value-pair. A list of currently understood options can be found below, all
other options will be ignored. Values that contain spaces must be quoted with
double quotes.
=back
+=head1 ENVIRONMENT
+
+The following environment variables are set by the plugin before calling
+I<exec>:
+
+=over 4
+
+=item COLLECTD_INTERVAL
+
+Value of the global interval setting.
+
+=item COLLECTD_HOSTNAME
+
+Hostname used by I<collectd> to dispatch local values.
+
+=back
+
=head1 USING NAGIOS PLUGINS
Though the interface is far from perfect, there are tons of plugins for Nagios.
The user, the binary is executed as, may not have root privileges, i.E<nbsp>e.
must have an UID that is non-zero. This is for your own good.
+=item
+
+Early versions of the plugin did not use a command but treated all lines as if
+they were arguments to the I<PUTVAL> command. When the I<PUTNOTIF> command was
+implemented, this behavior was kept for lines which start with an unknown
+command for backwards compatibility. This compatibility code has been removed
+in I<collectdE<nbsp>5>.
+
=back
=head1 SEE ALSO