Created attachment 1405199 [details]
alert manager UI

Description of problem:
configure rules file to catch alerts and then deploy prometheus,"site can’t be reached" error after cliking "Source" link in alertmanager web UI
check from the "alerts in alerts UI" of [Additional info] part, it seems generatorURL did not take correct value, it is 
"http://prometheus-0:9090/graph?g0.expr=up%7Bjob%3D%22kubernetes-nodes%22%7D+%3E+0\u0026g0.tab=1

Version-Release number of selected component (if applicable):
prometheus-alertmanager/images/v3.9.3-1
prometheus/images/v3.9.3-1
prometheus-alert-buffer/images/v3.9.3-1
oauth-proxy/images/v3.9.3-1

How reproducible:
Always

Steps to Reproduce:
1. Deploy prometheus 3.9 with alert rules file, rules file see the [Additional info] part
2. Log in alertmanager web UI with cluster-admin user, and click "Source" link in UI
3.

Actual results:
"site can’t be reached" error after cliking "Source" link in alertmanager web UI

Expected results:
Should be able to view source

Additional info:
# alert rules file
groups:
- name: example-rules
  interval: 30s # defaults to global interval
  rules:
  - alert: kubernetes-nodes > 0
    expr: up{job="kubernetes-nodes"} > 0
    annotations:
      miqTarget: "ContainerNode"
      severity: "HIGH"
      message: "up{job=\"kubernetes-nodes\"} > 0"


alerts in alerts UI.
https://alerts-openshift-metrics.apps.0307-hdf.qe.rhcloud.com/topics/alerts
{"generationID":"40ef7ca4-8db6-421d-a013-319578fb2aa0","messages":[{"index":1,"timestamp":"2018-03-07T07:42:30.232426708Z","data":{"alerts":[{"annotations":{"message":"up{job=\"kubernetes-nodes\"} \u003e 0","miqTarget":"ContainerNode","severity":"HIGH"},"endsAt":"0001-01-01T00:00:00Z","generatorURL":"http://prometheus-0:9090/graph?g0.expr=up%7Bjob%3D%22kubernetes-nodes%22%7D+%3E+0\u0026g0.tab=1","labels":{"alertname":"kubernetes-nodes \u003e 0","beta_kubernetes_io_arch":"amd64","beta_kubernetes_io_instance_type":"n1-standard-2","beta_kubernetes_io_os":"linux","failure_domain_beta_kubernetes_io_region":"us-central1","failure_domain_beta_kubernetes_io_zone":"us-central1-a","instance":"qe-juzhao-39-gce-3-master-etcd-1","job":"kubernetes-nodes","kubernetes_io_hostname":"qe-juzhao-39-gce-3-master-etcd-1","node_role_kubernetes_io_master":"true","openshift_infra":"apiserver","role":"node"},"startsAt":"2018-03-07T07:42:00.179442376Z","status":"firing"},{"annotations":{"message":"up{job=\"kubernetes-nodes\"} \u003e 0","miqTarget":"ContainerNode","severity":"HIGH"},"endsAt":"0001-01-01T00:00:00Z","generatorURL":"http://prometheus-0:9090/graph?g0.expr=up%7Bjob%3D%22kubernetes-nodes%22%7D+%3E+0\u0026g0.tab=1","labels":{"alertname":"kubernetes-nodes \u003e 0","beta_kubernetes_io_arch":"amd64","beta_kubernetes_io_instance_type":"n1-standard-2","beta_kubernetes_io_os":"linux","failure_domain_beta_kubernetes_io_region":"us-central1","failure_domain_beta_kubernetes_io_zone":"us-central1-a","instance":"qe-juzhao-39-gce-3-nrr-1","job":"kubernetes-nodes","kubernetes_io_hostname":"qe-juzhao-39-gce-3-nrr-1","metrics":"enabled","registry":"enabled","role":"node","router":"enabled"},"startsAt":"2018-03-07T07:42:00.179442376Z","status":"firing"}],"commonAnnotations":{"message":"up{job=\"kubernetes-nodes\"} \u003e 0","miqTarget":"ContainerNode","severity":"HIGH"},"commonLabels":{"alertname":"kubernetes-nodes \u003e 0","beta_kubernetes_io_arch":"amd64","beta_kubernetes_io_instance_type":"n1-standard-2","beta_kubernetes_io_os":"linux","failure_domain_beta_kubernetes_io_region":"us-central1","failure_domain_beta_kubernetes_io_zone":"us-central1-a","job":"kubernetes-nodes","role":"node"},"externalURL":"http://prometheus-0:9093","groupKey":"{}:{}","groupLabels":{},"receiver":"alert-buffer-wh","status":"firing","version":"4"}}]}