Where are Jenkins artifacts located?
Solution 1:
It is being archived on the master server (even if the build were on a slave) in the following folder:
$JENKINS_HOME/jobs/<job>/builds/<build>/archive
But you can configure a different location using the 'Advanced' setting of the job (where you can set a different workspace folder) or using plugins that are made for this purpose such as Copy Artifact Plugin
Solution 2:
Just another couple of tips...
You can find jenkins home by going to the environment variables page in the job build jenkins page.
In my case JENKINS_HOME turned out to be /var/lib/jenkins
Found artifacts in:
/var/lib/jenkins/jobs/<my-job-name>-build/lastStable/archive/target
/var/lib/jenkins/jobs/<my-job-name>-build/lastSsuccessful/archive/target
as well as
/var/lib/jenkins/jobs/<my-job-name>-build/builds/8/archive/target