public KafkaMessageConsumer(ILogger <KafkaMessageConsumer <TData> > logger,
IOptions <KafkaConsumerConfig <TData> > config,
IMetricsFactory <KafkaMessageConsumer <TData> >?metricsFactory,
IApplicationNameService applicationNameService,
ICloudEventFormatter cloudEventFormatter)
{
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
_applicationNameService = applicationNameService ?? throw new ArgumentNullException(nameof(config));
_cloudEventFormatter = cloudEventFormatter;
_config = config?.Value ?? throw new ArgumentNullException(nameof(config));
_consumerLagSummary = metricsFactory?.CreateSummary("consumer_lag_distribution",
"Contains a summary of current consumer lag of each partition", new [] { "topic", "partition" });
_consumerLagGauge = metricsFactory?.CreateGauge("consumer_lag",
"Contains current number consumer lag of each partition", false, "topic", "partition");
}
private void CreateMetrics(IMetricsFactory factory)
{
foreach (PropertyInfo property in typeof(MetricsImpl).GetProperties())
{
Type metricType = property.PropertyType;
if (!typeof(ICounter).IsAssignableFrom(metricType) &&
!typeof(ITimer).IsAssignableFrom(metricType) &&
!typeof(IGauge).IsAssignableFrom(metricType))
{
// Some frameworks dynamically add code that this reflection will pick up
// I only want this classes Stats based fields to be picked up.
continue;
}
StringBuilder metricBuilder = new StringBuilder("jaeger:");
Dictionary <string, string> tags = new Dictionary <string, string>();
var metricAttributes = property.GetCustomAttributes <MetricAttribute>();
foreach (MetricAttribute metricAttribute in metricAttributes)
{
metricBuilder.Append(metricAttribute.Name);
foreach (var tag in metricAttribute.Tags)
{
tags[tag.Key] = tag.Value;
}
}
string metricName = metricBuilder.ToString();
if (metricType == typeof(ICounter))
{
property.SetValue(this, factory.CreateCounter(metricName, tags));
}
else if (metricType == typeof(IGauge))
{
property.SetValue(this, factory.CreateGauge(metricName, tags));
}
else if (metricType == typeof(ITimer))
{
property.SetValue(this, factory.CreateTimer(metricName, tags));
}
else
{
throw new NotSupportedException($"'{metricType}' for metric '{property.Name}' is not supported.");
}
}
}
public BackgroundTaskQueue(IMetricsFactory <BackgroundTaskQueue <T> >?metricsFactory)
{
_elementsInQueue = metricsFactory?.CreateGauge("task_queue_enqueued_elements", "", false, "type")
?.WithLabels(typeof(T).Name);
_totalMessages = metricsFactory?.CreateCounter("total_messages", "", false, "type")?.WithLabels(typeof(T).Name);
}