@Lingaraj Mishra Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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The model usage limits are explained here.
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To answer your question, Please note there is no direct way to get this information.
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However, you can rely on the Custom Models- List REST APi to achieve this and get the count of the number of models. You need to have a custom logic to automate and check the count of custom models and then send notifications.
Hope this helps.
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