You are seeing an increase in malicious traffic coming from IP addresses.
With Acquia Cloud Edge, you can use firewall rules to give a challenge to all requests coming from these IP addresses.
1 Log into your Acquia Cloud Edge account
2. Click on the domain you want to protect , for example "domain.tld"
3. Then click on Firewall icon, and Tools
4. In the "IP Access Rules" block,
Enter the IP or the IP range , pick "Challenge", you can choose to either challenge the IP for this site or all your sites