Trying to execute https://github.com/openshift-metal3/dev-scripts to deploy an OCP 4.16 or 4.17 cluster (with the same configuration OCP 4.14 and 4.15 are instead working) with:
 MIRROR_IMAGES=true
 INSTALLER_PROXY=true

the bootstrap process fails with:

 level=debug msg=    baremetalhost resource not yet available, will retry
level=debug msg=    baremetalhost resource not yet available, will retry
level=info msg=  baremetalhost: ostest-master-0: uninitialized
level=info msg=  baremetalhost: ostest-master-0: registering
level=info msg=  baremetalhost: ostest-master-1: uninitialized
level=info msg=  baremetalhost: ostest-master-1: registering
level=info msg=  baremetalhost: ostest-master-2: uninitialized
level=info msg=  baremetalhost: ostest-master-2: registering
level=info msg=  baremetalhost: ostest-master-1: inspecting
level=info msg=  baremetalhost: ostest-master-2: inspecting
level=info msg=  baremetalhost: ostest-master-0: inspecting
E0514 12:16:51.985417   89709 reflector.go:147] k8s.io/client-go/tools/watch/informerwatcher.go:146: Failed to watch *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?allowWatchBookmarks=true&resourceVersion=5466&timeoutSeconds=547&watch=true": Service Unavailable
W0514 12:16:52.979254   89709 reflector.go:539] k8s.io/client-go/tools/watch/informerwatcher.go:146: failed to list *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?resourceVersion=5466": Service Unavailable
E0514 12:16:52.979293   89709 reflector.go:147] k8s.io/client-go/tools/watch/informerwatcher.go:146: Failed to watch *unstructured.Unstructured: failed to list *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?resourceVersion=5466": Service Unavailable
E0514 12:37:01.927140   89709 reflector.go:147] k8s.io/client-go/tools/watch/informerwatcher.go:146: Failed to watch *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?allowWatchBookmarks=true&resourceVersion=7800&timeoutSeconds=383&watch=true": Service Unavailable
W0514 12:37:03.173425   89709 reflector.go:539] k8s.io/client-go/tools/watch/informerwatcher.go:146: failed to list *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?resourceVersion=7800": Service Unavailable
E0514 12:37:03.173473   89709 reflector.go:147] k8s.io/client-go/tools/watch/informerwatcher.go:146: Failed to watch *unstructured.Unstructured: failed to list *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?resourceVersion=7800": Service Unavailable
level=debug msg=Fetching Bootstrap SSH Key Pair...
level=debug msg=Loading Bootstrap SSH Key Pair...

it looks like up to a certain point https://api.ostest.test.metalkube.org:6443 was reachable but then for some reason it started failing because its not using the proxy or is and it shouldn't be (???)

The 3 master nodes are reported as:
[root@ipi-ci-op-0qigcrln-b54ee-1790684582253694976 home]# oc get baremetalhosts -A
NAMESPACE               NAME              STATE        CONSUMER                ONLINE   ERROR              AGE
openshift-machine-api   ostest-master-0   inspecting   ostest-bbhxb-master-0   true     inspection error   24m
openshift-machine-api   ostest-master-1   inspecting   ostest-bbhxb-master-1   true     inspection error   24m
openshift-machine-api   ostest-master-2   inspecting   ostest-bbhxb-master-2   true     inspection error   24m

With something like:

 status:
  errorCount: 5
  errorMessage: 'Failed to inspect hardware. Reason: unable to start inspection: Validation
    of image href http://0.0.0.0:8084/34427934-f1a6-48d6-9666-66872eec9ba2 failed,
    reason: Got HTTP code 503 instead of 200 in response to HEAD request.'
  errorType: inspection error

on their status

    4.16, 4.17

    100%

    1. Try to create an OCP 4.16 cluster with dev-scrips with IP_STACK=v4, MIRROR_IMAGES=true and INSTALLER_PROXY=true
    2.
    3.
    

    level=info msg=  baremetalhost: ostest-master-0: inspecting
E0514 12:16:51.985417   89709 reflector.go:147] k8s.io/client-go/tools/watch/informerwatcher.go:146: Failed to watch *unstructured.Unstructured: Get "https://api.ostest.test.metalkube.org:6443/apis/metal3.io/v1alpha1/namespaces/openshift-machine-api/baremetalhosts?allowWatchBookmarks=true&resourceVersion=5466&timeoutSeconds=547&watch=true": Service Unavailable

    Successful deployment

I'm using IP_STACK=v4, MIRROR_IMAGES=true and INSTALLER_PROXY=true
with the same configuration (MIRROR_IMAGES=true and INSTALLER_PROXY=true) OCP 4.14 and OCP 4.15 are working.

When removing INSTALLER_PROXY=true, OCP 4.16 is also working.

I'm going to attach bootstrap gather logs