rook: Rook 1.0.3 throws 500 errors in the ceph dashboard

Is this a bug report or feature request?

• Bug Report

Deviation from expected behavior: In 0.9.3, the dashboard worked correctly. In 1.0.3, it comes up and somewhat works, but throws 500 errors in the application:

Expected behavior: No red 500 error boxes

How to reproduce it (minimal and precise): common.yaml and operator.yaml from the stock examples in 1.0.3:

kubectl apply -f rook/common.yaml
kubectl apply -f rook/operator.yaml
kubectl apply -f rook/cluster.yaml

cluster.yaml:

...
  dashboard:
    enabled: true
    ssl: false
  storage:
    useAllNodes: true
    useAllDevices: false
    # Important: Directories should only be used in pre-production environments
    directories:
    - path: /var/lib/rook

Istio ingress:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: ceph
  namespace: default
spec:
  hosts:
  - "ceph.example.com"
  - "ceph.green.example.com"
  - "ceph.blue.example.com"
  gateways:
  - elb-gateway.istio-system.svc.cluster.local
  http:
  - match:
    route:
    - destination:
        port:
          number: 8443
        host: rook-ceph-mgr-dashboard.rook-ceph.svc.cluster.local



**Environment**:
* OS (e.g. from /etc/os-release):
CoreOS
* Cloud provider or hardware configuration:
AWS/Kops
* Kubernetes version (use `kubectl version`):
kubectl version                                             
Client Version: version.Info{Major:"1", Minor:"12", GitVersion:"v1.12.6", GitCommit:"ab91afd7062d4240e95e51ac00a18bd58fddd365", GitTreeState:"clean", BuildDate:"2019-02-26T12:59:46Z", GoVersion:"go1.10.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"11", GitVersion:"v1.11.8", GitCommit:"4e209c9383fa00631d124c8adcc011d617339b3c", GitTreeState:"clean", BuildDate:"2019-02-28T18:40:05Z", GoVersion:"go1.10.8", Compiler:"gc", Platform:"linux/amd64"}

* Storage backend status (e.g. for Ceph use `ceph health` in the [Rook Ceph toolbox]:

kubectl -n rook-ceph exec -it $(kubectl -n rook-ceph get pod -l “app=rook-ceph-tools” -o jsonpath=‘{.items[0].metadata.name}’) bash bash: warning: setlocale: LC_CTYPE: cannot change locale (en_US.UTF-8): No such file or directory bash: warning: setlocale: LC_COLLATE: cannot change locale (en_US.UTF-8): No such file or directory bash: warning: setlocale: LC_MESSAGES: cannot change locale (en_US.UTF-8): No such file or directory bash: warning: setlocale: LC_NUMERIC: cannot change locale (en_US.UTF-8): No such file or directory bash: warning: setlocale: LC_TIME: cannot change locale (en_US.UTF-8): No such file or directory [root@ip-10-132-3-211 /]# ceph health HEALTH_WARN mons a,b are low on available space