I'll assume this is the plugin you're referring to: https://exchange.nagios.org/directory/Plugins/Security/check_ddos/details All this plugin does under the hood is run a netstat command and parse the output: netstat -antu | grep SYN_RECV | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -rn ...

"time_up": 1569920418, <-- How do I translate this into something meaningful? That looks like a Unix epoch to me: https://www.epochconverter.com/ Practically every main-stream programming language has standard libraries/tools for turning that into something human-readable. Also, practical...

Check the following configuration directives in your main Nagios Core configuration file to make sure they reflect your desired behavior: https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/4/en/configmain.html#retain_state_information retain_state_information state_retention_file retenti...

You might be able to get a similar effect with notes for a particular host/service: https://support.nagios.com/forum/viewtopic.php?f=7&t=48790&p=252672#p252672 I also get into modifying the source code to add custom elements to the status.cgi page: https://support.nagios.com/forum/viewtopic....

http://nagios-plugins.org/doc/guidelines.html Piping into sed is going to overwrite the exit code that was returned by the check_icmp plugin. You're seeing "OK" because your final sed command in the chain is returning 0 for the exit code. Your Bash logic should include something to make su...

Which version of NSClient++ is running on the Windows VMs? It's going to influence how filters for your check_nrpe executions are written. Here's a thread from the customer support section in which lmiltchev offers some logic to filter out \\?\Volume records from the check_drivesize results: https:/...

A related thread: https://support.nagios.com/forum/viewtopic.php?f=7&t=44016 Nagios has some internal timeouts that apply to all plugin executions. SNMP is sloooowwwww. If your snmpget command takes longer than 60 seconds to return, you may be hitting the service_check_timeout limit, which trigg...

Really sounds like you're looking for a custom event handler rather than a traditional Nagios plugin.

But yeah, all of that sounds very doable on a basic level and even something very typical of what people generally do with event handlers.

If you're willing to throw money at the problem, Nagios XI has pretty seamless integrations for performance data. Migrating from Core to XI is relatively painless: https://assets.nagios.com/downloads/nagiosxi/docs/Migrating-From-Nagios-Core-To-Nagios-XI.pdf If you're looking for something free, I'd ...

If you're looking for a paid, supported solution, there's nothing much better than Nagios XI . Nagios XI only manages a single core instance though, not multiple. Nagios Fusion can offer an overview of multiple Nagios Core/XI instances, but not consolidated management of all of those instances. For ...