Your Jenkins data directory "/home/jenkins" (AKA JENKINS_HOME) is almost full. You should act on it before it gets completely full.

[Artis Abolts]

Hi,

I Have "Your Jenkins data directory "/home/jenkins" (AKA JENKINS_HOME) is 
almost full. You should act on it before it gets completely full." warning 
message.

What I must delete, or maybe I can increase storage? 

On server I have much free space.