Investigating spike in page views (without spike in unique visitors)

Greetings- our project (melodious-narwhal-48a1d9) has been running for well over a year.
I checked the analytics yesterday and discovered an ongoing traffic spike in Page Views. On a typical day we have around 1,000 page views. But on the 24 hours around January 1st we had well over 200,000 page views.

However, we didn’t see any spike in Unique Visitors. On a typical day we have around 400-500 unique visitors and that’s what we saw in the 24 hours around January 1st.

So my assumption is we are not seeing a real spike in traffic. I’d like to investigate further, especially in case this starts to consume a significant chunk of our quotas. Is there any way to see information on the source of the traffic?