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I have joined 2 interesting graphics from the PDF: % CPU for 1 month and % http errors for 1 month.
It is strange to me that % CPU increases suddenly, about each week. (Note: this graphic is the %CPU of the Jenkins process, and not of the OS.)
And in the second graph, it seems that you have many http errors lately.
From the joined PDF:
It can be seen in the http statistics, that you have some downloads of very large artifacts (100 to 400 Mb) taking a long time.
And most importantly, in the "Detailed system information" from the PDF, it says:
Perm gen memory : 80 Mb / 82 Mb, which is quite full.
I suggest first to add a jvm parameter, probably in JENKINS_HOME/jenkins.xml: -XX:MaxPermSize=256m
And restart Jenkins.