protected virtual ICollector <IGauge> CreateRequestsInProgressGauge()
{
string[] defaultLabels = new[] { "operation" };
var configuration = new GaugeConfiguration
{
SuppressInitialValue = true,
LabelNames = defaultLabels
};
_options.ConfigureRequestsInProgressGauge?.Invoke(configuration);
if (configuration.LabelNames != defaultLabels)
{
throw new ArgumentException("The requests in progress gauge configuration is missing the required default labels");
}
return(_metrics.CreateGauge("http_server_requests_in_progress", "The number of HTTP requests currently being processed by the application", configuration));
}