using System;

using Prometheus;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        using var server = new Prometheus.MetricServer(port: 5099);

        server.Start();

        Gauge DesiredServersCount = Metrics.CreateGauge("desired_servers_count", "The desired number of servers.");

        Gauge ServersUsage = Metrics.CreateGauge("servers_usage", "The desired number of servers.", labelNames: new[] { "server_name" });

        // change the metric values

        DesiredServersCount.Set(5);

        ServersUsage.WithLabels("game-server-1").Set(5);

        ServersUsage.WithLabels("game-server-2").Set(1);

        ServersUsage.WithLabels("game-server-3").Set(0);

        ServersUsage.WithLabels("game-server-4").Set(11);

        ServersUsage.WithLabels("game-server-5").Set(0);

        ServersUsage.WithLabels("game-server-6").Set(10);

        ServersUsage.WithLabels("game-server-7").Set(0);

        // How to cleanup info about old servers:

        /*

        var active_servers = new List<string> {"game-server-1", "game-server-2", "game-server-3"};

        foreach (var labelValues in ServersUsage.GetAllLabelValues())

            if (active_servers.Contains(labelValues[0]))

                ServersUsage.RemoveLabelled(labelValues);

        */

    }

}