MetricController: Run only a single job per task (#660)

This changes the `spec.concurrencyPolicy` of the metric collector
cron-job from "Allow" (default) to "Forbid". The cronjob used to
create a new job even if the previous job had not succeeded. On
high-load clusters this could lead to a high number of jobs which
never finished.

This fixed #659

Author: epa095

manifests/v1alpha1/studyjobcontroller/metricsControllerConfigMap.yaml

@@ -14,6 +14,7 @@ data:
       schedule: "*/1 * * * *"
       successfulJobsHistoryLimit: 0
       failedJobsHistoryLimit: 1
+      concurrencyPolicy: Forbid
       jobTemplate:
         spec:
           backoffLimit: 0

manifests/v1alpha2/katib-controller/metricsControllerConfigMap.yaml

@@ -14,6 +14,7 @@ data:
       schedule: "*/1 * * * *"
       successfulJobsHistoryLimit: 0
       failedJobsHistoryLimit: 1
+      concurrencyPolicy: Forbid
       jobTemplate:
         spec:
           backoffLimit: 0