Unexplainable increase in Cloud Storage data egress since mid December 2024

Since December 12, 2024, there's been quite a noticeable increase in my Cloud Storage usage. I've tracked it down to data egress (see chart below), but I haven't figured out how to get more details (who's making these requests, etc..). There have been no changes to my project in the last year that would drive an increase like this, so what tools can I use to pinpoint the cause of this increase?