public async Task MultipleExportersTestAsync()
{
var opts = new PrometheusEndpointOptions();
var mopts = new ActuatorManagementOptions();
mopts.EndpointOptions.Add(opts);
var exporter1 = new PrometheusExporter();
var exporter2 = new SteeltoeExporter();
var multiExporter = new MultiExporter(new MetricExporter[] { exporter1, exporter2 }.ToList());
var processor = new SteeltoeProcessor(multiExporter);
var factory = AutoCollectingMeterFactory.Create(processor);
var meter = factory.GetMeter("Test");
SetupTestView(meter);
factory.CollectAllMetrics();
processor.ExportMetrics();
Task.Delay(1000).Wait();
var ep = new PrometheusScraperEndpoint(opts, exporter1);
var middle = new PrometheusScraperEndpointMiddleware(null, ep, mopts);
var context = CreateRequest("GET", "/actuator/prometheus");
await middle.HandleMetricsRequestAsync(context);
context.Response.Body.Seek(0, SeekOrigin.Begin);
var rdr = new StreamReader(context.Response.Body);
var text = await rdr.ReadToEndAsync();
Assert.Equal("# HELP test Testtest\n# TYPE test counter\ntest{a=\"v1\",b=\"v1\",c=\"v1\"} 45\n", text);
var meopts = new MetricsEndpointOptions();
var ep2 = new MetricsEndpoint(meopts, exporter2);
var middle2 = new MetricsEndpointMiddleware(null, ep2, mopts);
var context2 = CreateRequest("GET", "/actuator/metrics/test", "?tag=a:v1");
await middle2.HandleMetricsRequestAsync(context2);
Assert.Equal(200, context.Response.StatusCode);
context2.Response.Body.Seek(0, SeekOrigin.Begin);
StreamReader rdr2 = new StreamReader(context2.Response.Body);
string json = await rdr2.ReadToEndAsync();
Assert.Equal("{\"name\":\"test\",\"measurements\":[{\"statistic\":\"COUNT\",\"value\":45}],\"availableTags\":[{\"tag\":\"a\",\"values\":[\"v1\"]},{\"tag\":\"b\",\"values\":[\"v1\"]},{\"tag\":\"c\",\"values\":[\"v1\"]}]}", json);
}
public PrometheusScraperEndpoint(IPrometheusEndpointOptions options, PrometheusExporter exporter)
: base(options)
{
_exporter = exporter ?? throw new ArgumentNullException(nameof(exporter));
}
/// <summary>
/// Serialize to Prometheus Format.
/// </summary>
/// <param name="exporter">Prometheus Exporter.</param>
/// <param name="writer">StreamWriter to write to.</param>
public static void WriteMetricsCollection(this PrometheusExporter exporter, StreamWriter writer)
{
foreach (var metric in exporter.GetAndClearDoubleMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.DoubleSum:
{
var doubleSum = metric.Data as SumData <double>;
var doubleValue = doubleSum.Sum;
builder = builder.WithType("counter");
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(doubleValue);
foreach (var label in labels)
{
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.Summary:
{
var doubleSummary = metric.Data as SummaryData <double>;
builder = builder.WithType("summary");
var metricValueBuilder = builder.AddValue();
var mean = 0D;
if (doubleSummary.Count > 0)
{
mean = doubleSummary.Sum / doubleSummary.Count;
}
metricValueBuilder = metricValueBuilder.WithValue(mean);
foreach (var label in labels)
{
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
}
}
foreach (var metric in exporter.GetAndClearLongMetrics())
{
var labels = metric.Labels;
var builder = new PrometheusMetricBuilder()
.WithName(metric.MetricName)
.WithDescription(metric.MetricDescription);
switch (metric.AggregationType)
{
case AggregationType.LongSum:
{
var longSum = metric.Data as SumData <long>;
var longValue = longSum.Sum;
builder = builder.WithType("counter");
foreach (var label in labels)
{
var metricValueBuilder = builder.AddValue();
metricValueBuilder = metricValueBuilder.WithValue(longValue);
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
case AggregationType.Summary:
{
var longSummary = metric.Data as SummaryData <long>;
builder = builder.WithType("summary");
var metricValueBuilder = builder.AddValue();
var mean = 0L;
if (longSummary.Count > 0)
{
mean = longSummary.Sum / longSummary.Count;
}
metricValueBuilder = metricValueBuilder.WithValue(mean);
foreach (var label in labels)
{
metricValueBuilder.WithLabel(label.Key, label.Value);
}
builder.Write(writer);
break;
}
}
}
}
public PrometheusScraperEndpoint(IPrometheusOptions options, PrometheusExporter exporter, ILogger <PrometheusScraperEndpoint> logger = null)
: base(options)
{
_exporter = exporter ?? throw new ArgumentNullException(nameof(exporter));
_logger = logger;
}