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OTLP Exporter for OpenTelemetry .NET

NuGet NuGet

The OTLP (OpenTelemetry Protocol) exporter implementation.

Prerequisite

Installation

dotnet add package OpenTelemetry.Exporter.OpenTelemetryProtocol

Enable Trace Exporter

This exporter provides AddOtlpExporter() extension method on TracerProviderBuilder to enable exporting of traces. The following snippet adds the Exporter with default configuration.

var tracerProvider = Sdk.CreateTracerProviderBuilder()
    // rest of config not shown here.
    .AddOtlpExporter()
    .Build();

See the TestOtlpExporter.cs for runnable example.

Enable Metric Exporter

This exporter provides AddOtlpExporter() extension method on MeterProviderBuilder to enable exporting of metrics. The following snippet adds the Exporter with default configuration.

var meterProvider = Sdk.CreateMeterProviderBuilder()
    // rest of config not shown here.
    .AddOtlpExporter()
    .Build();

By default, AddOtlpExporter() pairs the OTLP MetricExporter with a PeriodicExportingMetricReader with metric export interval of 60 secs and Temporality set as Cumulative. See TestMetrics.cs for example on how to customize the MetricReaderOptions or see the Environment Variables section below on how to customize using environment variables.

Enable Log Exporter

// TODO

Configuration

You can configure the OtlpExporter through OtlpExporterOptions and environment variables. The OtlpExporterOptions type setters take precedence over the environment variables.

This can be achieved by providing an Action<OtlpExporterOptions> delegate to the AddOtlpExporter() method or using AddOptions<OtlpExporterOptions>().

If additional services from the dependency injection are required, they can be configured like this:

services.AddOptions<OtlpExporterOptions>().Configure<Service>((opts, svc) => {
    // ...
});

TODO: Show metrics specific configuration (i.e MetricReaderOptions).

OtlpExporterOptions

  • ExportProcessorType: Whether the exporter should use Batch or Simple exporting processor. The default is Batch.

  • BatchExportProcessorOptions: Configuration options for the batch exporter. Only used if ExportProcessorType is set to Batch.

  • Protocol: OTLP transport protocol. Supported values: OtlpExportProtocol.Grpc and OtlpExportProtocol.HttpProtobuf. The default is OtlpExportProtocol.Grpc.

  • Endpoint: Target to which the exporter is going to send traces or metrics. The endpoint must be a valid Uri with scheme (http or https) and host, and MAY contain a port and path. The default is "localhost:4317" for OtlpExportProtocol.Grpc and "localhost:4318" for OtlpExportProtocol.HttpProtobuf.

  • Headers: Optional headers for the connection.

  • HttpClientFactory: A factory function called to create the HttpClient instance that will be used at runtime to transmit telemetry over HTTP when the HttpProtobuf protocol is configured. See Configure HttpClient for more details.

  • TimeoutMilliseconds : Max waiting time for the backend to process a batch.

See the TestOtlpExporter.cs for an example of how to use the exporter.

Environment Variables

The following environment variables can be used to override the default values of the OtlpExporterOptions (following the OpenTelemetry specification).

Environment variable OtlpExporterOptions property
OTEL_EXPORTER_OTLP_ENDPOINT Endpoint
OTEL_EXPORTER_OTLP_HEADERS Headers
OTEL_EXPORTER_OTLP_TIMEOUT TimeoutMilliseconds
OTEL_EXPORTER_OTLP_PROTOCOL Protocol (grpc or http/protobuf)

The following environment variables can be used to override the default values of the PeriodicExportingMetricReaderOptions (following the OpenTelemetry specification.

Environment variable PeriodicExportingMetricReaderOptions property
OTEL_METRIC_EXPORT_INTERVAL ExportIntervalMilliseconds
OTEL_METRIC_EXPORT_TIMEOUT ExportTimeoutMilliseconds

NOTE: OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE is not supported yet #3756.

The following environment variables can be used to override the default values of the attribute limits (following the OpenTelemetry specification).

  • OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT
  • OTEL_ATTRIBUTE_COUNT_LIMIT

The following environment variables can be used to override the default values of the span limits (following the OpenTelemetry specification).

  • OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT
  • OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT
  • OTEL_SPAN_EVENT_COUNT_LIMIT
  • OTEL_SPAN_LINK_COUNT_LIMIT
  • OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT
  • OTEL_LINK_ATTRIBUTE_COUNT_LIMIT

Configure HttpClient

The HttpClientFactory option is provided on OtlpExporterOptions for users who want to configure the HttpClient used by the OtlpTraceExporter and/or OtlpMetricExporter when HttpProtobuf protocol is used. Simply replace the function with your own implementation if you want to customize the generated HttpClient:

services.AddOpenTelemetry()
    .WithTracing(builder => builder
        .AddOtlpExporter(o =>
        {
            o.Protocol = OtlpExportProtocol.HttpProtobuf;
            o.HttpClientFactory = () =>
            {
                HttpClient client = new HttpClient();
                client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value");
                return client;
            };
        }));

For users using IHttpClientFactory you may also customize the named "OtlpTraceExporter" and/or "OtlpMetricExporter" HttpClient using the built-in AddHttpClient extension:

services.AddHttpClient(
    "OtlpTraceExporter",
    configureClient: (client) =>
        client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value"));

Note: The single instance returned by HttpClientFactory is reused by all export requests.

Troubleshooting

This component uses an EventSource with the name "OpenTelemetry-Exporter-OpenTelemetryProtocol" for its internal logging. Please refer to SDK troubleshooting for instructions on seeing these internal logs.

References