guys,
I used helm tool to install otel-demo in my k8s cluster, run the following command:

helm install my-otel-demo open-telemetry/opentelemetry-demo

And I waited for some minutes, use the command

kubectl get pod

And I found that:

NAME                                                  READY   STATUS             RESTARTS         AGE
my-otel-demo-accountingservice-576d957954-wmcmw       1/1     Running            0                37m
my-otel-demo-adservice-fc5b87d6c-9jwr6                1/1     Running            0                37m
my-otel-demo-cartservice-5887676bc6-qz6bj             1/1     Running            0                37m
my-otel-demo-checkoutservice-566b544fc5-vnvp6         1/1     Running            0                37m
my-otel-demo-currencyservice-7f6974d6f-kjjmf          1/1     Running            0                37m
my-otel-demo-emailservice-645d9f4b7b-wkm94            1/1     Running            0                37m
my-otel-demo-flagd-5bc8d949d6-b29zr                   2/2     Running            0                37m
my-otel-demo-frauddetectionservice-955684b8d-wrl98    1/1     Running            0                37m
my-otel-demo-frontend-5cff554bd6-hl5rm                1/1     Running            0                37m
my-otel-demo-frontendproxy-9874cb858-kgj72            1/1     Running            0                37m
my-otel-demo-grafana-d7476ff94-mgvtl                  0/1     CrashLoopBackOff   10 (4m47s ago)   37m
my-otel-demo-imageprovider-59648dc969-jq8tb           1/1     Running            0                37m
my-otel-demo-jaeger-694b669cc8-kbt6j                  1/1     Running            0                37m
my-otel-demo-kafka-589d5c4dcd-tnqzl                   1/1     Running            0                37m
my-otel-demo-loadgenerator-6b7fddb4d9-gs6t6           1/1     Running            0                37m
my-otel-demo-otelcol-548877cf-2sh4x                   1/1     Running            0                37m
my-otel-demo-paymentservice-dcf745bc6-sqz2z           1/1     Running            0                37m
my-otel-demo-productcatalogservice-5fdf7b87d6-7m6rn   1/1     Running            0                37m
my-otel-demo-prometheus-server-56fb7845b9-qtnw5       1/1     Running            0                37m
my-otel-demo-quoteservice-d7c966699-7k5rg             1/1     Running            0                37m
my-otel-demo-recommendationservice-59448d97f9-zs7mc   1/1     Running            0                37m
my-otel-demo-shippingservice-74b4cd9ff8-xqsrb         1/1     Running            0                37m
my-otel-demo-valkey-558b4588d8-wp7gs                  1/1     Running            0                37m
otel-demo-opensearch-0                                1/1     Running            0                37m

And I used kubectl logs my-otel-demo-grafana-d7476ff94-mgvtl and found :

Error: ✗ Get "https://grafana.com/api/plugins/grafana-opensearch-datasource/versions": dial tcp: lookup grafana.com on 10.96.0.10:53: server misbehaving

and

# kubectl describe pod  my-otel-demo-grafana-d7476ff94-mgvtl
...
Conditions:
  Type              Status
  Initialized       True 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Events:
  Type     Reason     Age                    From               Message
  ----     ------     ----                   ----               -------
  Normal   Scheduled  45m                    default-scheduler  Successfully assigned default/my-otel-demo-grafana-d7476ff94-mgvtl to node-1
  Normal   Pulling    45m                    kubelet            Pulling image "docker.io/grafana/grafana:11.3.1"
  Normal   Pulled     40m                    kubelet            Successfully pulled image "docker.io/grafana/grafana:11.3.1" in 5m7.830781113s
  Normal   Started    39m (x3 over 39m)      kubelet            Started container grafana
  Warning  Unhealthy  39m (x9 over 39m)      kubelet            Readiness probe failed: Get "http://10.0.0.188:3000/api/health": dial tcp 10.0.0.188:3000: connect: connection refused
  Normal   Created    38m (x4 over 39m)      kubelet            Created container grafana
  Normal   Pulled     38m (x3 over 39m)      kubelet            Container image "docker.io/grafana/grafana:11.3.1" already present on machine
  Warning  BackOff    4m59s (x159 over 39m)  kubelet            Back-off restarting failed container

My cluster coreDNS pod is running. I do not know how to fix the problem. Thank you for your help!

I want to see the effect of OpenTelemetry, then install it for the microservices on my cluster, and finally do some telemery work.