In the US most universities follow the guidelines set by the American Association of University Professors. Their website is https://www.aaup.org/issues/tenure
A quick google search can be helpful: https://www.google.com/search?q=tenure%20policy%20computing%20OR%20%22computer%20science%22
In the field of computing in most universities tenure evaluation is based on three factors: Teaching, Research, and Service. You will not find many policies which fix the venues (e.g., ISI indexed) or number of publications (e.g., 10)