cortex-query-frontend config error resulting CrashLoopBackOff about observatorium HOT 3 CLOSED

$ kubectl -n observatorium describe pod observatorium-xyz-cortex-query-frontend-db5989b46-r9qfb
Name:         observatorium-xyz-cortex-query-frontend-db5989b46-r9qfb
Namespace:    observatorium
Priority:     0
Node:         crc-w6th5-master-0/192.168.130.11
Start Time:   Tue, 17 Mar 2020 16:40:40 +0200
Labels:       app.kubernetes.io/component=query-cache
              app.kubernetes.io/instance=observatorium-xyz
              app.kubernetes.io/name=cortex-query-frontend
              app.kubernetes.io/part-of=observatorium
              app.kubernetes.io/version=master-fdcd992f
              pod-template-hash=db5989b46
Annotations:  k8s.v1.cni.cncf.io/networks-status:
                [{
                    "name": "openshift-sdn",
                    "interface": "eth0",
                    "ips": [
                        "10.128.1.71"
                    ],
                    "dns": {},
                    "default-route": [
                        "10.128.0.1"
                    ]
                }]
              openshift.io/scc: restricted
Status:       Running
IP:           10.128.1.71
IPs:
  IP:           10.128.1.71
Controlled By:  ReplicaSet/observatorium-xyz-cortex-query-frontend-db5989b46
Containers:
  cortex-query-frontend:
    Container ID:  cri-o://1dcdd7f1d365bf2b027f6ef36665c8f771849527308bccb437aed5a5541b4666
    Image:         quay.io/cortexproject/cortex:master-fdcd992f
    Image ID:      quay.io/cortexproject/cortex@sha256:8e9302c22c33a8e3d1568470b3d45532d6256251c6204be3928c03a4c61b70cc
    Port:          9090/TCP
    Host Port:     0/TCP
    Args:
      -log.level=debug
      -config.file=/etc/cache-config/config.yaml
      -querier.max-retries-per-request=0
      -frontend.downstream-url=http://observatorium-xyz-thanos-query.observatorium.svc.cluster.local.:9090
    State:          Running
      Started:      Tue, 17 Mar 2020 16:40:55 +0200
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /etc/cache-config/ from query-cache-config (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-gdjcq (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  query-cache-config:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      observatorium-xyz-cortex-query-frontend
    Optional:  false
  default-token-gdjcq:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-gdjcq
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type    Reason     Age        From                         Message
  ----    ------     ----       ----                         -------
  Normal  Scheduled  <unknown>  default-scheduler            Successfully assigned observatorium/observatorium-xyz-cortex-query-frontend-db5989b46-r9qfb to crc-w6th5-master-0
  Normal  Pulling    73s        kubelet, crc-w6th5-master-0  Pulling image "quay.io/cortexproject/cortex:master-fdcd992f"
  Normal  Pulled     67s        kubelet, crc-w6th5-master-0  Successfully pulled image "quay.io/cortexproject/cortex:master-fdcd992f"
  Normal  Created    66s        kubelet, crc-w6th5-master-0  Created container cortex-query-frontend
  Normal  Started    66s        kubelet, crc-w6th5-master-0  Started container cortex-query-frontend