'How to free up space on a Node in Jenkins

So the Jenkins controller's built-in node that I have is running out of disk space. The error that I am getting is following-

Built-In Node (the Jenkins controller's built-in node)
Disk space is too low. Only 1.022GB left on /var/lib/jenkins.

Projects tied to Built-In Node
None

But I am not sure how to free up the disk space on it. I attached a picture of the error as well. IS there any way to free up the space on this node?enter image description here



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