Drop in impression and click across different ads placement on 15th Dec

[shifaligarg10]

Hi Team,

Topsort has reported drop in impression and click across different ads placement on 15th Dec.
After analysing our dashboards, we can see drop in bubbles as well as banners events. We have analysed our event_processor which seems fine to us.
Attached are snapshots where we can see the drop in impression & click events:

the screenshot

Please help identify what could be the root cause for this drop