Were the robots at the end of X-men: Apocalypse Sentinels?
I assumed they were, but I also heard otherwise.
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Visually, they appear to match the 1973 design that the X-Men encountered in Washington DC. (Since they're in shadow, they may have slightly changed.)
At the end of X-Men: Apocalypse, the X-Men appear to be in the Danger Room. In both the comics and the movies, the Danger Room is a training room. Depending on the era of stories, the Danger Room is full of either actual mechanical dangers, holographic ones, or a combination of both. In X-Men: The Last Stand, the team ran a training exercise against holographic sentinels in a holographic environment.