If the app is not supported, you could still use it, but that's a risk you have to take.
Other options are, look at the Solarwind application and find out what methods does it offer in terms of sending data to other systems, this could be syslog, logs files, API, once you understand this, you need to look at the options you have in Splunk, so look at using a Universal forwarder with syslog file collection, or use the UF to collect logs files, or send data from the Solarwinds app to a Splunk HEC endpoint.
After this you can develop your TA to work on the props and transforms to format the data, into Splunk events.
Also try and understand the data you want, example, is it alerts, inventory, etc.
