Where is the page_alter in Drupal 8?

Hello, in Drupal 7 we can use hook_page_alter to change the array of the page, delete some options, add another options, etc…

I’m looking to be able to make the same like this https://github.com/oskarcalvo/acb/blob/7.x-1.x/abr.module#L140-L166 in D8.

Thanks.

Oskar

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