Hello,
in many linux versions the comman netstat is now deprecated. Now you have the problem to use the sourcetype netstat within the Linux/Unix Addon in Splunk. Is there a possibility to use another command, e.g. ss instead of netstat in future as sourcetype? Many thanks in advance.
Are you talking about this app? https://splunkbase.splunk.com/app/273/
If you have access to the app config files, you should be able to swap the netstat command with "ss," though I couldn't tell you exactly how without knowing which app you are referring to.