Discard built artefacts sooner. No one uses Cassandra artefacts built by Jenkins.

 ref:
     - https://lists.apache.org/thread.html/r0dea866e2708d4c6fd7ef8af46c938960631aac13d6822d7abcc5284%40%3Cdev.cassandra.apache.org%3E
     - https://jenkinsci.github.io/job-dsl-plugin/#method/javaposse.jobdsl.dsl.jobs.FreeStyleJob.logRotator
diff --git a/jenkins-dsl/cassandra_job_dsl_seed.groovy b/jenkins-dsl/cassandra_job_dsl_seed.groovy
index c4d72c7..48f2570 100644
--- a/jenkins-dsl/cassandra_job_dsl_seed.groovy
+++ b/jenkins-dsl/cassandra_job_dsl_seed.groovy
@@ -139,6 +139,7 @@
     label(slaveLabel)
     logRotator {
         numToKeep(50)
+        artifactNumToKeep(1)
     }
     wrappers {
         timeout {
@@ -188,6 +189,7 @@
     label(slaveLabel)
     logRotator {
         numToKeep(50)
+        artifactNumToKeep(1)
     }
     wrappers {
         timeout {
@@ -233,6 +235,7 @@
     description(jobDescription)
     logRotator {
         numToKeep(50)
+        artifactNumToKeep(1)
     }
     wrappers {
         timeout {
@@ -418,7 +421,7 @@
         label(slaveLabel)
         logRotator {
             numToKeep(50)
-            artifactNumToKeep(3)
+            artifactNumToKeep(1)
         }
         wrappers {
             timeout {
@@ -471,6 +474,7 @@
     label(slaveLabel)
     logRotator {
         numToKeep(50)
+        artifactNumToKeep(1)
     }
     wrappers {
         timeout {
@@ -525,6 +529,7 @@
     concurrentBuild()
     logRotator {
         numToKeep(50)
+        artifactNumToKeep(1)
     }
     wrappers {
         timeout {