Hi,
As Application Insights is connected to Log Analytics the actual cost and usage is on the Log Analytics workspace. You can use the following the following document Analyze usage in a Log Analytics workspace. Note that Application Insights stored data in several tables. If you have multiple Application Insights instances connect to the same Log Analytics workspace when you use the queries you can filter to specific Application Insights by using _ResourceId column. That will contain the different Application Insights instance resource it. You can use TimeGenerated column to scope to specific time period of your choice. By having the usage data you can easily calculate the cost by looking at the public pricing for Azure Monitor. Azure Cost Management no longer shows separate pricing for log ingestion when the Application Insights is connected to Log Analytics workspace. However the functionality described above can give you much more details on the usage and based on that you can calculate the pricing.Please "Accept the answer" if the information helped you. This will help us and others in the community as well.