What there something in the documentation that was unclear? http://docs.nagvis.org/1.9/en_US/index.html I don't see anything in the install instructions that is Centreon specific: http://docs.nagvis.org/1.9/en_US/installer.html http://docs.nagvis.org/1.9/en_US/installation_instructions.html Paths to...

I want to know, Do this script check the text within the source code itself? That is exactly how it works. By parsing the raw HTML returned by the HTTP request. Sometimes what happened is, a URL has one or more links available or some variable within the source code from which it gets the data also...

In the case of CVE-2021-37344 specifically, the "Nagios XI Switch Wizard" is not included with Nagios Core and there would be no cause for concern unless you, for whatever reason, decided to include that component in a Nagios Core installation yourself. It would be quite non-standard to do...

If there's a SNMP OID that measures the thing you're interested in, you can check it with check_snmp:
https://nagios-plugins.org/doc/man/check_snmp.html

I think to get any sort of charts in Nagios Core, you'd need to install something like PNP4Nagios:
http://docs.pnp4nagios.org/start

Or Nagflux:
https://github.com/Griesbacher/nagflux

Is it possible to use both plugins at the same time using a nsclient++ agent on different port? Yes. Within your nsclient configuration file. You can configure NSClient++ with a NRPE server (to receive check_nrpe requests) using the NRPEServer block: https://docs.nsclient.org/reference/client/NRPES...

C, for the most part: https://github.com/nagios-plugins/nagios-plugins Some Perl, Bash, and Python in there too. Depends on the specific plugin you're looking at. Here's check_ping and check_dummy: https://github.com/nagios-plugins/nagios-plugins/blob/master/plugins/check_dummy.c https://github.com/...

This depends mostly on how Nagios Core and it's various plugins were installed. You'll probably need to rebuild an awful lot of Nagios Core plugins going from CentOS 5 to 7, primarily due to significant differences in the Perl and C dependencies. Also, migrating from Nagios Core 3.x to 4.x is going ...

I'm not sure about the present, but in the past this could be a simple forums post in the customer section (not here) or a support ticket.

The JSON CGIs are your best friend: https://labs.nagios.com/2014/06/19/exploring-the-new-json-cgis-in-nagios-core-4-0-7-part-1/ Those CGIs should be included with any modern Nagios Core installation. To get all services associated with a contactgroup named admins : http://your.nagios.instance/cgi-bi...