Allows you to move measurement tag instrumentation from your website or app to a server-side processing container.
https://developers.google.com/tag-platform/tag-manager/server-side
Analytics and Tracking
Get access to data on 89,152 websites that are GTM Server Side Tagging Customers. We know of 69,225 live websites using GTM Server Side Tagging and an additional 19,927 sites that used GTM Server Side Tagging historically and 21,393 websites in the United States.
Get a list of 89,152 websites using GTM Server Side Tagging which includes location information, hosting data, contact details, 69,225 currently live websites and an additional 68,368 domains that redirect to sites in this list. 19,927 sites that used this technology previouslyand 21,393 websites in the United States currently using GTM Server Side Tagging.
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