Is it possible to delete user created sourcetypes on splunk cloud, i checked under all configurations and sourcetypes options but didn't found anything.
Anyone has an idea? I guess we need to open a case to splunk support for deletion?
I use Splunk Cloud as well and sometime see a "Delete" option. I don't know what makes it available.
The only other solution I can offer is to upload a new version of the app that contains that sourcetype, but without the sourcetype.
Either way, removing the sourcetype means events with that sourcetype may not be processed properly.
Yes, you should be able to delete custom sourcetypes. Go to Settings->Sourcetypes and the Actions column will contain "Delete" for those sourcetypes you can delete. I don't know how Splunk decides which sourcetypes you can and cannot delete, however.