Multivariate time series

I work for a telecom company, my work is to predict the cell sites(1000+) when its going to hit the threshold levels. For example these cell sites cant handle more traffic above than the threshold. I need to predict in advance so that i can do an upgrade/add cellsite for that location.
My question here is how to build a single model for 10000+ cell sites with multiple other variables. Please suggest.

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