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Switch exporter

This is a Prometheus exporter that collects counters from a switch and makes them available for Prometheus to scrape. It has been written specifically for Mellanox switches running MLNX-OS and Onyx; it probably will not work on other switches as it uses regular expressions that are sensitive to the exact output formats.

The metric endpoint is http://HOST:PORT/metrics?target=TARGET, where TARGET is the address of the switch. The initial scrape will be slower as it establishes a connection to the switch, enumerates the ports and gets remote endpoint information from LLDP.

To configure it in Prometheus, you will most likely want a configuration something like this, which arranges for instance labels to reflect the switch rather than the exporter service.

scrape_configs:
  - job_name: 'switches'
    static_configs:
      - targets:
          - SWITCH1
          - SWITCH2
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: host:port     # endpoint of this exporter