Library functions and modules should be in the 3 man page section. Also the files should end in '.3'

docs/man/man3/ansible.nagios.3

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+.TH ANSIBLE.NAGIOS 5 "2012-10-02" "0.8" "ANSIBLE MODULES"
+." generated from library/nagios
+.SH NAME
+nagios \- Perform common tasks in Nagios related to downtime and notifications.
+." ------ DESCRIPTION
+.SH DESCRIPTION
+.PP
+The \fInagios\fR module has two basic functions: scheduling downtime and toggling alerts for services or hosts. 
+.PP
+All actions require the \fChost\fR parameter to be given explicitly. In playbooks you can use the \fC$inventory_hostname\fR variable to refer to the host the playbook is currently running on. 
+.PP
+You can specify multiple services at once by separating them with commas, .e.g., \fCservices=httpd,nfs,puppet\fR. 
+.PP
+When specifying what service to handle there is a special service value, \fIhost\fR, which will handle alerts/downtime for the \fIhost itself\fR, e.g., \fCservice=host\fR. This keyword may not be given with other services at the same time. \fISetting alerts/downtime for a host does not affect alerts/downtime for any of the services running on it.\fR 
+.PP
+When using the \fInagios\fR module you will need to specify your nagios server using the \fCdelegate_to\fR parameter. 
+." ------ OPTIONS
+."
+."
+.SH OPTIONS
+
+.IP action
+Action to take.
+.IR Choices :
+downtime,enable_alerts,disable_alerts,silence,unsilence.(required)
+.IP host
+Host to operate on in Nagios.(required)
+.IP author
+Author to leave downtime comments as. - Only useable with the \fCdowntime\fR action. (default: Ansible)
+.IP services
+What to manage downtime/alerts for. Separate multiple services with commas.\fCservice\fR is an alias for \fCservices\fR.\fBRequired\fR option when using the \fCdowntime\fR, \fCenable_alerts\fR, and \fCdisable_alerts\fR actions.(required)
+.IP minutes
+Minutes to schedule downtime for.Only useable with the \fCdowntime\fR action. (default: 30)
+.IP cmdfile
+Path to the nagios \fIcommand file\fR (FIFO pipe).Only required if auto-detection fails. (default: auto-detected)."
+."
+." ------ NOTES
+."
+."
+." ------ EXAMPLES
+.SH EXAMPLES
+.PP
+.nf
+nagios action=downtime minutes=30 service=httpd host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=downtime minutes=60 service=host host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=downtime services=frob,foobar,qeuz host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=enable_alerts service=smart host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=disable_alerts service=httpd,nfs host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=disable_alerts service=host host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=silence host=$inventory_hostname
+.fi
+.PP
+.nf
+nagios action=unsilence host=$inventory_hostname
+.fi
+." ------- AUTHOR
+.SH AUTHOR
+Tim Bielawa
+.SH SEE ALSO
+.IR ansible (1),
+.I http://ansible.github.com/modules.html#nagios