feat(ins): add info about scaleway-vmagent

Author: bene2k1

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

@@ -21,6 +21,11 @@ The QEMU Guest Agent (QGA) is a daemon designed to run inside virtual machines,
 
 The QGA source code is publicly available in the [QEMU repository on GitLab](https://gitlab.com/qemu-project/qemu/-/blob/master/docs/interop/qemu-ga.rst).
 
+<Message type="note">
+  In addition to the QGA, another daemon is preinstalled on recently created Instances: `scaleway-vmagent`. This agent was developed by Scaleway's engineering teams and is used to send metrics about your VM to [Cockpit](/cockpit/) to monitor the status of your Instance. 
+  You can find the source code of the agent on Scaleway's [Launchpad repository](https://launchpad.net/~scaleway/+archive/ubuntu/stable/+packages).
+</Message>
+
 ## What are the features provided by QGA?
 
 Running the QEMU Guest Agent (QGA) on your Instance currently enables the following feature: