Hi,
If I understand correctly you are most likely referring to this Azure service update: retiring the beta API in Azure Monitor Log Analytics. This post has link to Migrate from using batch and beta queries to the standard Log Analytics query API. On that page you can see the beta APIs that are deprecated. Basically if you have queries that start with URL https://api.loganalytics.azure.com/beta/. These APIs are usually used if you develop some custom app or some script that queries the Log Analytics workspace. If you do not have such scenario than there is no action for you as you do not use them. There is no other way to find out if you are using beta API or not besides checking for custom apps or scripts that use the API to query the Log Analytics workspace.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.