@aman35 you could poll the data using REST API by building a custom-addon using splunk add-on builder or if these logs are writing to a file, you could monitor/read it by installing a splunk agent . Coming to splunk cloud, splunk cloud SH provides universal forwarder crdentials package.. If you are using UF approach, you need to download these credentials and place it on the splunk UF @/opt/splunkforwarder/etc/apps location and create a gitlab app with inputs.conf and deploy it to the same location and perform a splunk restart.
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