check_netstat.pl performance data

[Ezudin]

I have integrated the plugin in my Nagios installation on Ubuntu server and the data is displayed correctly

Now, I am trying to use performance data with Nagios & PNP4Nagios but without success.

Example output:
user@nagios:# /usr/local/nagios/libexec/check_nrpe -H remote_server -c check_smtp_connections
OK - smtp_in is 3 | smtp_in=3;:3;~:5

At the remote_server the command is defined in /usr/local/nagios/etc/nrpe.cfg
command[check_smtp_connections]=/usr/local/nagios/libexec/check_netstat.pl -p "<smtp" -w ">3" -c ">5" -f

The graph in Nagios/PNP4Nagios cannot be displayed. It seams the format of performance data is not correct comparing with http://docs.pnp4nagios.org/pnp-0.6/perfdata_format

Can you help me to resolve this problem?