There is an updated pull request by bahamas10 against master on the void-packages repository

https://github.com/bahamas10/void-packages nagios
https://github.com/void-linux/void-packages/pull/23249

New package: nagios-4.4.6
`nrpe` and `monitoring-plugins` are already available as packages... this changes adds the nagios core itself into the set of available packages.

4.4.6 is the latest release available.

### Testing

I built the package and installed it with:

```
./xbps-src -f pkg nagios
xi nagios
```

I then enabled the service:

```
ln -s /etc/sv/nagios /var/service
```

And verified it was running with:

```
$ sudo cat /var/service/nagios/supervise/pid
30982
$ nagiostats 

Nagios Stats 4.4.6
Copyright (c) 2003-2008 Ethan Galstad (www.nagios.org)
Last Modified: 2020-04-28
License: GPL

CURRENT STATUS DATA
------------------------------------------------------
Status File:                            /var/nagios/status.dat
Status File Age:                        0d 0h 0m 3s
Status File Version:                    4.4.6

Program Running Time:                   0d 0h 0m 3s
Nagios PID:                             30982

```

Notice the PID in the `nagiostats` output matches the PID according to runit.

A patch file from https://github.com/void-linux/void-packages/pull/23249.patch is attached