Hello @Anand Kumar Mortha ,
Thank you for your question.
Once the 31-day free trial for Azure Sentinel expires, you will incur charges for using the MS Training lab of Sentinel. During the free trial, both Log Analytics data ingestion and Microsoft Sentinel charges are waived. However, after the trial period ends, you will be billed according to the standard pricing for data ingestion and Sentinel services.
For more detailed information, you can refer to the Microsoft Sentinel Training Lab guide and the Azure Sentinel pricing details.
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