@Leonardo Torres Altez I think you are looking at the total calls metric of your document intelligence resource. The number of calls in this case is the sum of all calls to the service i.e calls through training, analyze operation, management of models like list models, copy models etc. You will have to use the filter operation to lookup the OperationName property or dimension to understand the number of calls made for analyze or other available values.
If you are looking to calculate cost per document, the default metrics do not provide this capability to filter by document as the billing is done for per 1000 pages irrespective of no. of documents or size of the documents. You will have to enable diagnostic settings to lookup requests made to each document and then compute the cost per document. Usually, if you are request is successful you are charged for each page depending on the number of pages successfully processed in the document.
I hope this helps!!
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