In splunkbase we have an old app but for splunk cloud we dont have any app like that. If anyone have any inputs please share. Except Webhook method and DB connector method.
I don't think so, I mean these plugins were tightly coupled in the past and I don't think any vendor is keeping the support on - for such plugins, maintaining them for upward compatibility becomes a challenge as these tools has evolved over a period of time.
If its Splunk cloud you might as well want to look into 'Splunk Add-on for REST APIs' - you can probably connect to SolarWinds via APIs and pull the data out of SolarWinds onto Splunk.
Hope this helps.