@goku321

Thanos, Prometheus and Golang version used: v0.20.0 docker image

Object Storage Provider: gcs

What happened:

• configured --exemplar=... on our local and global queriers
• configure grafana for exemplars

What you expected to happen:

• grafana "time series" panel should show exemplars.
  however...
  the time series panel includes the full query from the panel, including external labels used by the local prom
  instances.
  the query_range queries work as expected.
  query_exemplars did not.

If I send the query_exemplars a query including the external labels, I get an empty response.
If I remove the external labels and just use labels the local prom instance knows about, I get responses.

How to reproduce it (as minimally and precisely as possible):

• configure a prometheus with external labels, with sidecar
• configure thanos query to see the sidecar
• query thanos-query with the external labels.
  (we have a second tier of queriers, but I do not think that is causing the issue.