Add support for parsing `/usr/local/nagios/var/status.dat`

[atc0005]

Overview

From what I can tell this file is used equally by Nagios XI and Core instances to store current service check status details. Per documentation, Nagios XI stores the information in its MySQL database, but at some point the information is also written out to this file.

I do not know the frequency or how out of sync the information between the status.dat file and the db might be.

References

• https://support.nagios.com/kb/article/nagios-xi-last-check-time-not-updating-19.html
• https://stackoverflow.com/questions/503148/how-to-parse-nagios-status-dat-file