Print warning when OOMKiller occured

By making tests with new MicroShfit release, some of our pods from time
to time got OOMKill, that later disturb the tests.
This commit will print a warning, when the pod was killed by the
OOMKiller, so we can increase the resources.

Change-Id: I10d7163f20486e9764d2f8b51c8aa0301b05995e

roles/post/get-k8s-cluster-resources/tasks/main.yaml

@@ -37,3 +37,14 @@
     - pv
   tags:
     skip_ansible_lint
+
+- name: Check if some pod was OOMKilled
+  ansible.builtin.shell: |
+    kubectl get events --all-namespaces --sort-by='.lastTimestamp' -A | grep -i oom | tee {{ output_dir }}/oomkilled.log
+  register: _oomkill_status
+  ignore_errors: true
+
+- name: Print warning message when OOMKill occured
+  ansible.builtin.shell: |
+    echo -e "\n\n\n\nOOMKill occured!\n{{ _oomkill_status.stdout }}\n\n\n\n"
+  when: _oomkill_status.stdout | length > 0