您的curl命令格式不正确，这就是您看到这个问题的原因。还有其他一些线程与您从curl收到的错误消息有关。
然而，一个快速的解决办法是在一条线上提供 curl 。以下是可行的：

---
apiVersion: batch/v1
kind: Job
metadata:
  name: grafanauser-ttl
spec:
  ttlSecondsAfterFinished: 100
  template:
    spec:
      containers:
        - name: grafanauser
          image: curlimages/curl:7.72.0
          command:
            - /bin/sh
            - -ec
            - 'curl -X POST "http://admin:admin@grafana.utility.svc.cluster.local/api/admin/users" -H "Content-Type:application/json" -d "{"name":"test","email":"test@localhost.com","login":"test","password":"test","OrgId": 1}"'
      restartPolicy: OnFailure

我没有运行该服务，但您应该不会再收到curl错误：

$ kubectl logs grafanauser-ttl-xjt2q
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: grafana.utility.svc.cluster.local

shell命令行将转换为

curl -X POST "http://admin:admin@grafana.utility.svc.cluster.local/api/admin/users"                 -H "Content-Type:application/json" -d                 "{"name":"test","email":"test@localhost.com","login":"test","password":"test","OrgId": 1}"

这会让shell去掉所有的引号：

curl -X POST http://admin:admin@grafana.utility.svc.cluster.local/api/admin/users -H Content-Type:application/json -d {name:test,email:test@localhost.com,login:test,password:test,OrgId: 1}

curl将阻塞在最后一个1}（它的最后一个参数）上
尝试使用YAML块文本重写它：

command:
            - '/bin/sh'
            - '-ec'          
            - |
                curl -X POST "http://admin:admin@grafana.utility.svc.cluster.local/api/admin/users" \
                -H "Content-Type:application/json" -d \
                '"{"name":"test","email":"test@localhost.com","login":"test","password":"test","OrgId": 1}'