RequestsMeter.cs

public class RequestsMeter
{
    private static readonly Meter s_meter = new Meter("MyCompany.MyApp.Requests", "1.0.0");
    
    private static readonly Counter<long> s_requestCounter = 
        s_meter.CreateCounter<long>("request-count", description: "Total number of requests");
    
    private static readonly ObservableGauge<int> s_queueLengthGauge = 
        s_meter.CreateObservableGauge("queue-length", 
            () => GetQueueLength(), 
            description: "Current queue length");
    
    public static void RecordRequest()
    {
        s_requestCounter.Add(1);
    }
    
    private static int GetQueueLength() 
    { 
        // TODO: Add implementation
        return Random.Shared.Next(0, 100);
    }
}