Grafana panel doesn't show the instance addresses in SSL Probes: Instance whose certificate is about to expire

[nobuto-m]

Bug Description

The bottom panel Expired in less than X days doesn't show the instance addresses like URL but only shows the identical juju_model_uuid + juju_application for multiple items.

probe_ssl_earliest_cert_expiry{juju_application=~"$juju_application",juju_model=~"$juju_model",juju_model_uuid=~"$juju_model_uuid",juju_unit=~"$juju_unit",probe_target=~"$probe_target"} - time() < (3600 * 24 * 30)

To Reproduce

$ juju deploy blackbox-exporter-k8s blackbox-exporter --channel latest/edge

$ juju config blackbox-exporter probes_file="
scrape_configs:
  - job_name: 'blackbox_k8s_endpoints'
    metrics_path: /probe
    params:
      module: [http_2xx]
    static_configs:
      - targets:
        - http://ubuntu.com
        - https://ubuntu.com
        - https://releases.ubuntu.com
"

$ juju relate prometheus:metrics-endpoint blackbox-exporter:self-metrics-endpoint
$ juju relate grafana:grafana-dashboard blackbox-exporter:grafana-dashboard

Then open Grafana, and change the query to < (3600 * 24 * 90) to fill the panel just for testing.

Environment

blackbox-exporter-k8s latest/edge 3

Relevant log output

N/A

Additional context