Description of problem: In the disconnected env, there are OCP 4 and OCP 311 managed clusters are managed by Hub. metric collector on the OCP 4 would forward metrics back to the Hub, but OCP 311 failed:

```

level=warn caller=logger.go:50 ts=2023-05-16T08:02:04.465590682Z component=forwarder component=metricsclient msg="error: failed to forward request happened at time: 5.883489053s"
level=warn caller=logger.go:50 ts=2023-05-16T08:02:10.35384366Z component=forwarder component=metricsclient msg="failed to forward request" err="Post \"https://observatorium-api-open-cluster-management-observability.apps.o4-disco2.disco.qe.red-chesterfield.com/api/metrics/v1/default/api/v1/receive\": dial tcp: lookup observatorium-api-open-cluster-management-observability.apps.o4-disco2.disco.qe.red-chesterfield.com on 10.0.29.181:53: server misbehaving"

```

this issue happens in the disconnected env, I sent the all access info to smeduri1@redhat.com and dbennett@redhat.com on Slack. 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

1. In the disconnect Hub env, deploy MCOCR
2. metrics collector is deployed and running on the OCP 311 managed cluster
3. but metrics collector reports failed to forward requests.

Actual results:

Expected results:

Additional info: