Thanks for the follow up!

While I don't see anything very obvious in the controller api-server container, I see this from `juju debug-log -l TRACE --replay` and of course in the logs of the api-server container. I am attaching the full log.

application-kubeflow-volumes: 10:06:56 DEBUG juju.worker.dependency "api-caller" manifold worker stopped: [946658] "application-kubeflow-volumes" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
stack trace:
dial tcp 10.152.183.39:17070: connect: connection refused
github.com/juju/juju/api.gorillaDialWebsocket:756: 
github.com/juju/juju/api.dialer.dial1:1176: 
github.com/juju/juju/api.dialer.dial:1151: unable to connect to API
github.com/juju/juju/api.dialWebsocketMulti:1047: 
github.com/juju/juju/api.dialAPI:705: 
github.com/juju/juju/api.Open:218: 
github.com/juju/juju/worker/apicaller.connectFallback:161: 
github.com/juju/juju/worker/apicaller.OnlyConnect:58: 
github.com/juju/juju/worker/apicaller.ManifoldConfig.startFunc.func1:97: [946658] "application-kubeflow-volumes" cannot open api
application-kubeflow-volumes: 10:06:56 DEBUG juju.worker.apicaller connecting with old password
application-kubeflow-volumes: 10:06:56 DEBUG juju.api looked up controller-service.controller-uk8s.svc.cluster.local -> [10.152.183.39]
application-kubeflow-volumes: 10:06:57 DEBUG juju.worker.apicaller [946658] failed to connect
application-kubeflow-volumes: 10:06:57 DEBUG juju.worker.dependency "api-caller" manifold worker stopped: [946658] "application-kubeflow-volumes" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
stack trace:
dial tcp 10.152.183.39:17070: connect: connection refused
github.com/juju/juju/api.gorillaDialWebsocket:756: 
github.com/juju/juju/api.dialer.dial1:1176: 
github.com/juju/juju/api.dialer.dial:1151: unable to connect to API
github.com/juju/juju/api.dialWebsocketMulti:1047: 
github.com/juju/juju/api.dialAPI:705: 
github.com/juju/juju/api.Open:218: 
github.com/juju/juju/worker/apicaller.connectFallback:161: 
github.com/juju/juju/worker/apicaller.OnlyConnect:58: 
github.com/juju/juju/worker/apicaller.ManifoldConfig.startFunc.func1:97: [946658] "application-kubeflow-volumes" cannot open api
application-kubeflow-volumes: 10:06:57 ERROR juju.worker.dependency "api-caller" manifold worker returned unexpected error: [946658] "application-kubeflow-volumes" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
model-946658c9-f947-48cb-89e1-cfc55ab360ac: 10:06:58 ERROR juju.worker.dependency "api-caller" manifold worker returned unexpected error: [946658] "model-946658c9-f947-48cb-89e1-cfc55ab360ac" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
application-kubeflow-volumes: 10:07:01 DEBUG juju.worker.apicaller connecting with old password
application-kubeflow-volumes: 10:07:01 DEBUG juju.api looked up controller-service.controller-uk8s.svc.cluster.local -> [10.152.183.39]
application-kubeflow-volumes: 10:07:01 DEBUG juju.worker.apicaller [946658] failed to connect
application-kubeflow-volumes: 10:07:01 DEBUG juju.worker.dependency "api-caller" manifold worker stopped: [946658] "application-kubeflow-volumes" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
stack trace:
dial tcp 10.152.183.39:17070: connect: connection refused
github.com/juju/juju/api.gorillaDialWebsocket:756: 
github.com/juju/juju/api.dialer.dial1:1176: 
github.com/juju/juju/api.dialer.dial:1151: unable to connect to API
github.com/juju/juju/api.dialWebsocketMulti:1047: 
github.com/juju/juju/api.dialAPI:705: 
github.com/juju/juju/api.Open:218: 
github.com/juju/juju/worker/apicaller.connectFallback:161: 
github.com/juju/juju/worker/apicaller.OnlyConnect:58: 
github.com/juju/juju/worker/apicaller.ManifoldConfig.startFunc.func1:97: [946658] "application-kubeflow-volumes" cannot open api
application-kubeflow-volumes: 10:07:01 ERROR juju.worker.dependency "api-caller" manifold worker returned unexpected error: [946658] "application-kubeflow-volumes" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
model-946658c9-f947-48cb-89e1-cfc55ab360ac: 10:07:02 ERROR juju.worker.dependency "api-caller" manifold worker returned unexpected error: [946658] "model-946658c9-f947-48cb-89e1-cfc55ab360ac" cannot open api: unable to connect to API: dial tcp 10.152.183.39:17070: connect: connection refused
controller-0: 10:07:02 INFO juju.worker.apicaller [946658] "controller-0" successfully connected to "localhost:17070"
controller-0: 10:07:02 INFO juju.worker.logforwarder config change - log forwarding not enabled
controller-0: 10:07:02 INFO juju.worker.logger logger worker started