Because workspace-based Application Insights resources store their data in a Log Analytics workspace, the billing for data ingestion and retention is done by the workspace where the Application Insights data is located. For this reason, you can use all options of the Log Analytics pricing model, including commitment tiers, along with pay-as-you-go.
https://zcusa.951200.xyz/en-us/azure/azure-monitor/logs/cost-logs#application-insights-billing