Well, if you mean shields.io, they don’t have access to your IP if you use the .svg endpoint of uptime.lemmings.world, they only have IP of the server. If you mean my service, well, I don’t even log the IP address.
This is literally everything that’s in the logs in case of a successful response:
Also, IP address on its own is not GDPR protected, it’s only GDPR protected when it’s identifiable. So even if I had your IP in my logs, I wouldn’t have to let you know, because I have no other personally identifiable information.
Source: I was part of the process of implementing GDPR for an app whose whole purpose is pretty much managing personal data.