In my case I am trying to use external_labels for applying a standard
cluster name label for the kubernetes_cluster.
I am expecting that when an alert triggers via the alertmanager, this label
should be present in the output.
However, it seems like the label is not present or I have done something
wrong.
This is how the Prometheus config looks:
```
prometheus.yml: |
global:
external_labels:
kubernetes_cluster_name: xyz
```
But the alert comes out of alertmanager without that label:
Under what conditions should we expect to see the external_labels?
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