Node labels not seen on the grafana dashboard when prometheus is deployed without pv enabled

[spoorti22]

Proposal

Label values for a variable defined in Grafana dashboard doesn't seem to capture the data.

Bug Report

The label values which is created as a variable, is not getting the data
This api should give the node/pod values /api/v1/label/kubernetes_io_hostname/values
{"status":"success","data":[]}

What did you expect to see?
The node/pod values should have been seen

What did you see instead? Under which circumstances?
{"status":"success","data":[]}
Not able to get the label values.

---

• System information:

  Linux 3.10.0-862.2.3.el7.x86_64 x86_64

• Prometheus version:

  prometheus, version 2.3.2 (branch: HEAD, revision: 71af5e2)
  build user: root@5258e0bd9cc1
  build date: 20180712-14:02:52
  go version: go1.10.3

• Alertmanager version:

  alertmanager, version 0.15.2 (branch: HEAD, revision:
  d19fae3bae451940b8470abb680cfdd59bfa7cfa)
  build user: root@3101e5b68a55
  build date: 20180814-10:53:39
  go version: go1.10.3

• Prometheus configuration file:

The config is same as below: 
https://github.com/prometheus/prometheus/blob/master/documentation/examples/prometheus-kubernetes.yml

Have deployed prometheus with no PV enabled, after redeploying it is able to fetch the label values. But what could be the main issue?

[brian-brazil]

It makes more sense to ask questions like this on the prometheus-users mailing list rather than in a GitHub issue. On the mailing list, more people are available to potentially respond to your question, and the whole community can benefit from the answers provided.