User Agent Info
User Agent Info power-up gives you an ability to add header to your server hits, and you can then access that information on your server container and use it for your reporting.
X-Device-Mobile, X-Device-Os, X-Device-Browser, X-Device-Browser-Version, X-Device-Engine, X-Device-Model, X-Device-Platform, X-Device-Engine-Version header is added in event data inside your server Google Tag Manager.
How to enrich user data in your server-side GTM [User Agent Info, User ID, Bot detection power-ups]
Useful links
Use cases of the power-up
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