Is `blackbox_exporter` the only way to check if a specific local port is listening?

Monitoring and Observability Prometheus
1

Maybe someone can sanity check me on this - is blackbox_exporter the only way to check if a specific local port is listening? I can’t seem to find the metrics I need in node_exporter - basically I just want to make sure postgres (which runs in a docker container on the host) is running…

I’ve had to run blackbox_exporter on the host to TCP probe itself on the appropriate port - I’m sure there’s a better way to do this…

    metrics_path: /probe
    params:
      module: [tcp_connect]
    static_configs:
      - targets:
        - '127.0.0.1:5432'
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: [<http://ip.of.my|ip.of.my>.server]:9115```