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Comment on Flexible Feature Control at Instagramparent

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I'm not clear from the post, is this used only to gate features in servers or is this used to gate features in the mobile clients as well? If it's used in the mobile clients, how is that done (in particular, checking looks to be synchronous, but would obviously need to be async to work)

This is primarily a server-gating feature. For the mobile clients, they periodically sync their experiment flags state using a call to the backend (eg at app start), which is handled using a related, but separate, system to Gate Logic.

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