Graph builder container of UpdateService instance is getting OOMKilled

Issue

• The service pods created by OpenShift Update Service operator are stuck in crashloobackoff state.

$ oc get pods -n openshift-update-service
NAME                                         READY   STATUS             RESTARTS   AGE
service-xxxx                                 1/2     CrashLoopBackOff   8          2m  
service-xxxx                                 1/2     CrashLoopBackOff   8          2m    
updateservice-operator-xxxx                  1/1     Running            0          2h

• The graph-builder container is getting constantly getting restarted due to invoking OOMKiller frequently.

    lastState:
      terminated:
        containerID: cri-o://cbxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        exitCode: 137                   <=============
        finishedAt: '2021-08-16T05:08:32Z'
        reason: OOMKilled               <=============
        startedAt: '2021-08-16T05:08:13Z'
    name: graph-builder