Content Comparison

  public class MetricSample : BaseDevice<MetricSampleConfiguration>
  {
    private IHistogram m_SendDurationHistogram;   // measure the time taken to send the payload
    
public override void Start()
    {
      // make sure you call InitializeMetrics
      InitializeMetrics();
    }
    protected  public override void InitializeMetrics()
    {
      // construct your metrics here
      m_SendDurationHistogram = GetOrCreateHistogram("MyDevice.send_duration_in_s",                           // name of your metric. See notes about X.y syntax
                                                     "The duration (in seconds) to send to the foo service",  // description
                                                     new HistogramConfiguration                               // configuration
                                                     {
                                                       LabelNames = new[] { "Group", "Tab", "Channel", "ChannelKey" },          // associate this metric with the owner channel
                                                       Buckets = new double[] { 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 5, 10 }  // buckets (in seconds)
                                                     }).WithLabels(MessageChannel.GroupName, MessageChannel.TabName, MessageChannel.ChannelName, MessageChannel.ChannelKeyString);
    }

    public override Task ProcessMessageAsync(IMessageContext context, CancellationToken cancellationToken)
    {
      // ...your code           
      using (m_SendDurationHistogram.NewTimer())    // the Histogram.NewTimer() method is used to measure the wrapped methods duration.
      { 
        await SendToFooServiceAsync(...).ConfigureAwait(false);
      }
      // ... your code
    }
  }

The InitializeMetrics method is called by the base class any time a user changes the metrics configuration. By initializing your metrics in this override, your metric(s) will automatically enable and disable Your metric(s) will automatically be enabled and disabled (when users change the metric configuration) without requiring a service restart.