Sure, here's an example of a custom Netdata monitor configuration where we use a command line tool to provide a metric:

Create a new file in the /etc/netdata/python.d/ directory (you can name it anything you like, as long as it ends with .conf).
Add the following lines to the file:

{
    "update_every": 1,
    "priority": 60000,
    "retries": 3,
    "timeout": 5,
    "charts": {
        "my_custom_chart": {
            "title": "My Custom Chart",
            "units": "Count",
            "type": "line",
            "family": "custom",
            "dimensions": {
                "count": {
                    "type": "integer",
                    "total": "sum"
                }
            }
        }
    },
    "data": [
        {
            "module": "command",
            "command": "/path/to/my/command --metric=count",
            "name": "my_custom_metric",
            "dimensions": {
                "count": "count"
            },
            "interval": 1
        }
    ]
}

In this example, we're using the command module to run a custom command (/path/to/my/command --metric=count) that outputs a metric value. The name of the metric is my_custom_metric, and we're using the dimensions field to specify a dimension called count. The interval field specifies how often the command should be run (in this case, every 1 second).

We're also defining a chart called my_custom_chart, which will display the count dimension of our my_custom_metric metric.

Note that you'll need to replace /path/to/my/command with the actual path to your command, and --metric=count with the actual command line argument that tells your command to output the metric you want to monitor.
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