Regarding your question: "Has the LiveOps feature been removed or deprecated? I can no longer find any documentation for it, and it seems to be missing from the dashboard as well."
I am not 100% sure which feature you are referring to. But maybe you are referring to a feature in our upcoming 6.0 release?
In brainCloud6.0, we will be moving Promotions and Redemptions to a new Braincloud Category called Live Ops.
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We will also be introducing a new feature called Campaigns. (In some previews we may have described it as Live Ops Campaigns).
Campaigns are a major showcase of the 6.0 release and will enable Scheduled Limited-Time Game Modes and A/B Scenarios (w/ built-in promotions)
Additional features being released in 6.0 will compliment the development of Promotions and Campaigns making them incredibly easy to develop and powerful.
Could it be possible you saw a sneak peek at the Live Ops Campaigns feature?
Let me know,
Thanks
JH