show hostname rather than internal ip in alert message

[nina guo]

Hi,

Many I ask how to show hostname rather than internal ip in alert message.

With the following settings, $labels.hostname still displays the internal ip.

alert rules definition:

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      - alert: HighCpuLoad

        expr: 100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80

        for: 5m

        labels:

          severity: warning

        annotations:

          summary: "High CPU load (instance {{ $labels.hostname }})"

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relabel config

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relabel_configs:

         - source_labels: [__meta_openstack_instance_name]

           target_label: hostname

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