I am seeing a sudden increase in Edge requests. All seem to come from access to icon assets.
I have checked and my vercel.json did not configure caching for those assets. I’ve fixed that now, but I wonder if we can find out what caused the sudden spike in requests to those resources specifically?
Adding caching headers to the assets helped to completely eliminate the spikes.
I still wonder though, what caused the sudden spike in requests to those specific assests:
/assets/bricktally-icon-maskable-512.png
/assets/bricktally-icon-maskable-192.png
/assets/bricktally-icon-512.png
/assets/bricktally-icon-192.png
Could those be PWA assets that the OS kept refreshing in the background on users devices?
Hi @pke, welcome to the Vercel Community!
Thanks for enabling caching. It can certainly help with website performance but not in this particular case because the IP address was same for these requests.
Unless you ordered a load test on your website, I don’t see any other natural reason for it.
It looks like someone was trying to DDoS you. You can find more information about such patterns in the Observability tab of your Vercel dashboard. In there, you can use the Query tab to group the Edge requests by IP Address or User Agent to get clear data.
I narrowed down most of your usage to a specific IP address and have shared the same with our Firewall team to investigate or blacklist the IP.
Moreover, when you notice such sudden spikes it’s best to turn on the Attack Challenge Mode on the Vercel Firewall dashboard to ensure our Firewall mitigates the traffic.
Let me know if you’ve any questions.
Thanks for your answer! Since I am on the free plan I can’t investigate the issue further using Observability/Query. So thanks for looking into it. I can see a banned IP from India in the Firewall now, guess that you guys added it?
An no, I did not order a load test 
It’s a free hobby project that might be useful for some LEGO collectors/sellers.
Thanks again for looking into the issue!