Update datasets-download-stats.md

Author: lhoestq

docs/hub/datasets-download-stats.md

@@ -2,7 +2,11 @@
 
 ## How are download stats generated for datasets?
 
-The Hub provides download stats for all datasets loadable via the `datasets` library. To determine the number of downloads, the Hub counts every time `load_dataset` is called in Python, excluding Hugging Face's CI tooling on GitHub. No information is sent from the user, and no additional calls are made for this. The count is done server-side as we serve files for downloads. This means that:
+Counting the number of downloads for datasets is not a trivial task, as a single dataset repository might contain multiple files, from multiple subsets and splits (e.g. train/validation/test) and sometimes with many files in a single split. To avoid double counting downloads (e.g., counting a single download of a dataset as multiple downloads), the Hub counts as one download every series of files requests in an interval of 5 minutes per user. No information is sent from the user, and no additional calls are made for this. The count is done server-side as the Hub serves files for downloads. Every HTTP request to the files, including `GET` and `HEAD`, will be counted as a download.
 
-* The download count is the same regardless of whether the data is directly stored on the Hub repo or if the repository has a [script](/docs/datasets/dataset_script) to load the data from an external source.
-* If a user manually downloads the data using tools like `wget` or the Hub's user interface (UI), those downloads will not be included in the download count.
+## Before Setpember 2024
+
+The Hub used to provide download stats only for the datasets loadable via the `datasets` library. To determine the number of downloads, the Hub used to count every time `load_dataset` is called in Python, excluding Hugging Face's CI tooling on GitHub. No information was sent from the user, and no additional calls were made for this. The count was done server-side as we served files for downloads. This means that:
+
+* The download count was the same regardless of whether the data is directly stored on the Hub repo or if the repository has a [script](/docs/datasets/dataset_script) to load the data from an external source.
+* If a user manually downloaded the data using tools like `wget` or the Hub's user interface (UI), those downloads were not included in the download count.