Vector - Collector pods fails to start when forwarding logs to Loki using tenantKey

$ oc get csv
NAME                            DISPLAY                            VERSION   REPLACES   PHASE
clusterlogging.v5.4.0           Red Hat OpenShift Logging          5.4.0                Succeeded
elasticsearch-operator.v5.4.0   OpenShift Elasticsearch Operator   5.4.0                Succeeded 

apiVersion: "logging.openshift.io/v1"
kind: "ClusterLogging"
metadata:
  name: "instance" 
  namespace: "openshift-logging"
spec:
  managementState: "Managed"  
  logStore:
    type: "elasticsearch"  
    retentionPolicy: 
      application:
        maxAge: 10h
      infra:
        maxAge: 10h
      audit:
        maxAge: 10h
    elasticsearch:
      nodeCount: 1 
      storage: {} 
      resources: 
          limits:
            memory: "4Gi"
          requests:
            memory: "1Gi"
      proxy: 
        resources:
          limits:
            memory: 256Mi
          requests:
            memory: 256Mi
      redundancyPolicy: "ZeroRedundancy"
  visualization:
    type: "kibana"  
    kibana:
      replicas: 1
  collection:
    logs:
      type: "vector"  
      vector: {} 

apiVersion: logging.openshift.io/v1
kind: ClusterLogForwarder
metadata:
  name: instance
  namespace: openshift-logging
spec:
  outputs:
  - name: loki-server
    type: loki
    loki:
      tenantKey: kubernetes.pod_name
    url: http://loki-ingester-http-lokistack-dev.lokicluster.svc:3100
  pipelines:
  - name: to-loki
    inputRefs:
    - application
    outputRefs:
    - loki-server 

$ oc get pods
NAME                                           READY   STATUS             RESTARTS      AGE
cluster-logging-operator-5cb5867fc7-5rbtm      1/1     Running            0             5h12m
collector-4c7bc                                1/2     CrashLoopBackOff   1 (16s ago)   19s
collector-d6mp9                                1/2     CrashLoopBackOff   1 (15s ago)   19s
collector-f2h56                                1/2     CrashLoopBackOff   1 (16s ago)   19s
collector-h9mnt                                1/2     CrashLoopBackOff   1 (14s ago)   19s
collector-jnb2w                                1/2     Error              2 (15s ago)   19s
collector-l4v4t                                1/2     CrashLoopBackOff   1 (16s ago)   19s
elasticsearch-cdm-ib58ker0-1-6bf8d674b-m2zr9   2/2     Running            0             45s
kibana-6cc8d5f7bf-6fp6c                        2/2     Running            0             45s

$ oc logs collector-h9mnt -c collector
Jan 13 09:18:39.048  INFO vector::app: Log level is enabled. level="debug"
Jan 13 09:18:39.048  INFO vector::sources::host_metrics: PROCFS_ROOT is unset. Using default '/proc' for procfs root.
Jan 13 09:18:39.048  INFO vector::sources::host_metrics: SYSFS_ROOT is unset. Using default '/sys' for sysfs root.
Jan 13 09:18:39.048  INFO vector::app: Loading configs. path=[("/etc/vector/vector.toml", Some(Toml))]
Jan 13 09:18:39.051 ERROR vector::cli: Configuration error. error=expected an equals, found a right brace at line 59 column 33
 

# Logs from containers (including openshift containers)
[sources.raw_container_logs]
type = "kubernetes_logs"
auto_partial_merge = true
exclude_paths_glob_patterns = ["/var/log/pods/openshift-logging_collector-*/*/*.log", "/var/log/pods/openshift-logging_elasticsearch-*/*/*.log", "/var/log/pods/openshift-logging_kibana-*/*/*.log"][transforms.container_logs]
type = "remap"
inputs = ["raw_container_logs"]
source = '''
  level = "unknown"
  if match(.message,r'(Warning|WARN|W[0-9]+|level=warn|Value:warn|"level":"warn")'){
    level = "warn"
  } else if match(.message, r'Info|INFO|I[0-9]+|level=info|Value:info|"level":"info"'){
    level = "info"
  } else if match(.message, r'Error|ERROR|E[0-9]+|level=error|Value:error|"level":"error"'){
    level = "error"
  } else if match(.message, r'Debug|DEBUG|D[0-9]+|level=debug|Value:debug|"level":"debug"'){
    level = "debug"
  }
  .level = level  .pipeline_metadata.collector.name = "vector"
  .pipeline_metadata.collector.version = "0.14.1"
  ip4, err = get_env_var("NODE_IPV4")
  .pipeline_metadata.collector.ipaddr4 = ip4
  received, err = format_timestamp(now(),"%+")
  .pipeline_metadata.collector.received_at = received
  .pipeline_metadata.collector.error = err
 '''
[transforms.route_container_logs]
type = "route"
inputs = ["container_logs"]
route.app = '!(starts_with!(.kubernetes.pod_namespace,"kube") && starts_with!(.kubernetes.pod_namespace,"openshift") && .kubernetes.pod_namespace == "default")'
# Rename log stream to "application"
[transforms.application]
type = "remap"
inputs = ["route_container_logs.app"]
source = """
.log_type = "application"
"""
[transforms.to-loki]
type = "remap"
inputs = ["application"]
source = """
.
"""[sinks.loki_server]
type = "loki"
inputs = ["to-loki"]
endpoint = "http://loki-ingester-http-lokistack-dev.lokicluster.svc:3100"
tenant_id = {kubernetes.pod_name}[sinks.loki_server.encoding]
codec = "json"[sinks.loki_server.labels]
kubernetes_container_name = "{{kubernetes.container_name}}"
kubernetes_host = "${NODE_NAME}"
kubernetes_namespace_name = "{{kubernetes.namespace_name}}"
kubernetes_pod_name = "{{kubernetes.pod_name}}"
log_type = "{{log_type}}"