docs(ins): add configuration information

Author: bene2k1

pages/instances/reference-content/understanding-qemu-guest-agent.mdx

@@ -26,6 +26,17 @@ The QGA source code is publicly available in the [QEMU repository on GitLab](htt
   You can find the source code of the agent on Scaleway's [Launchpad repository](https://launchpad.net/~scaleway/+archive/ubuntu/stable/+packages).
 </Message>
 
+## Which tasks are allowed for the QGA?
+
+Scaleway has intentionally restricted the QGA to the following allowed tasks (configured in `/etc/qemu/qemu-ga.conf`):
+
+* `guest-file-close`
+* `guest-file-open`
+* `guest-file-write`
+* `guest-ping`
+
+All other Remote Procedure Calls (RPCs) are disabled to limit the scope of external execution from the QEMU hypervisor.
+
 ## What are the features provided by QGA?
 
 Running the QEMU Guest Agent (QGA) on your Instance currently enables the following feature: