How to export data from Splunk to Azure Sentinel

brapp404 thanks for your comment. You can use this app to export historical data from Splunk to Sentinel but this addon is designed for small volume like notable events. In order to import data from Splunk, you can use a PowerShell script which export logs then push it to the log analytics workspace API or using logstash LAW output plugin. We are working on a new document which explain all the migration process including historical data.