Set complete system to read only?

I wanted to ask if there is a possibility that you set the entire Mattermost system to Read-Only?
You can still log in, but no longer post or create new teams / chat.

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Iā€™d interested in this too. I imagine the UI/API to be available but not allow any modification. This, combined with the banner, could be used to keep folks from interfearing with upgrades (which may be operting on the database). I suppose I could throw up a 503 under construction, but would prefer this read only mode.