Keep only certain metrics with remote_write

[ginkel]

Hi there,

I'd like to export a certain subset of my metrics from Prometheus to Grafana Mimir using Prometheus' remote_write feature. So far so good. Config looks like this:

remote_write:
- name: mimir
  url: "https://<mimir_fqdn>/api/v1/push"
  write_relabel_configs:
      - source_labels: ["__name__"]
        regex: ^(t_delay)$
        action: keep
  headers:
    X-Scope-OrgID: tenant

Unfortunately, no metrics show up in Mimir (but another remote write destination with different [drop] filtering works). Is the configuration I use to only keep metrics named t_delay correct?

Thanks,
Thilo