Or even both. In any kind of continuous deployment, you'd expect outages at the point of deployment, or shortly thereafter as the unintended consequences ripple.
Then the load during the working days makes those ripples larger and into outages.
Most outages are caused by changes by humans ("actors"?), very rarely are things "People just dig our stuff so much we can't keep up" but more often "We didn't think about this performance drawback when we built thing X, now it's hurting us", and of course, more outages when you try to fix those issues without fully considering the scope and impact.