Bug 2129117

Description of problem (please be detailed as possible and provide log
snippests):

ODF fails to connect to external cluster unless a monitoring endpoint is enabled. Since external cluster can mean 3rd party provided external cluster, monitored by different team, exposing ceph metrics endpoint shouldn't be ODF requirement. It is NOT listed as a requirement here: https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.10/html/deploying_and_managing_openshift_data_foundation_using_red_hat_openstack_platform/deploying_openshift_data_foundation_on_red_hat_openstack_platform_in_external_mode#creating-an-openshift-data-foundation-cluster-service-for-external-storage_external-osp


Version of all relevant components (if applicable):


Does this issue impact your ability to continue to work with the product
(please explain in detail what is the user impact)?

Yes, ODF refuses to connect to the cluster unless there's a metrics exporter


Is there any workaround available to the best of your knowledge?

Create a fake metrics exporter and adjust rook-ceph-external-cluster-details Secrets accordingly


Rate from 1 - 5 the complexity of the scenario you performed that caused this
bug (1 - very simple, 5 - very complex)?


Can this issue reproducible?

Yes

Can this issue reproduce from the UI?

Yes

If this is a regression, please provide more details to justify this:


Steps to Reproduce:
1. Install ODF
2. Try deploying external cluster connecting to a Ceph which doesn't expose metrics endpoint publicly

Actual results:

Operator complains that metrics endpoint is unreachable


Expected results:

Deploys fine without cluster monitoring

Additional info:

Documentation is worded a bit confusingly giving impression that monitoring may be optional:

https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.10/html/deploying_openshift_data_foundation_in_external_mode/deploy-openshift-data-foundation-using-red-hat-ceph-storage#creating-an-openshift-data-foundation-cluster-service-for-external-storage_ceph-external

Quote:

--monitoring-endpoint
Is optional. It accepts comma separated list of IP addresses of active and standby mgrs reachable from the OpenShift Container Platform cluster. If not provided, the value is automatically populated.
--monitoring-endpoint-port
This is optional. It is the port associated with the ceph-mgr Prometheus exporter specified by --monitoring-endpoint. If not provided, the value is automatically populated.

Relevant GH Issue:
https://github.com/operate-first/apps/pull/2391