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[Tracing] Add experimental support for exporting traces as OTLP (.NET 6+) #8211

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[Tracing] Add experimental support for exporting traces as OTLP (.NET 6+) #8211

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3e65620
Add a new IApi.Ping method to separate the initial ping operation fro…
zacharycmontoya Feb 6, 2026
eaa5827
Refactor SpanBuffer to encapsulate TraceChunk serialization into a sm…
zacharycmontoya Feb 6, 2026
188717a
Introduce TracesEncoding enum on IApi, which ultimately determines th…
zacharycmontoya Feb 6, 2026
4c850fd
Add OTLP JSON implementation and incorporate it into AgentWriter/Span…
zacharycmontoya Feb 6, 2026
0e63f7a
Refactor OTLP metrics to accommodate trace stats use cases. This incl…
zacharycmontoya Feb 6, 2026
5e187e9
Update our client-side stats aggregation classes to account for the w…
zacharycmontoya Feb 6, 2026
9ed8b78
Add OTLP trace exporter and OTLP metrics exporter (needed for emittin…
zacharycmontoya Feb 12, 2026
8dc33c9
Refactor OtlpExporter so it can be used directly by our OTLP metrics …
zacharycmontoya Feb 12, 2026
5aa4cbf
Create new IApi implementations to send trace stats via OTLP metrics …
zacharycmontoya Feb 12, 2026
8c7e634
Update ExporterSettings and pass it into the OtlpExporter
zacharycmontoya Feb 13, 2026
e729239
Add snapshot tests for OTLP export in test OpenTelemetrySdkTests.Subm…
zacharycmontoya Feb 17, 2026
1a51a7b
Rename TracesEncoding.DatadogV0 to TracesEncoding.DatadogV0_4
zacharycmontoya Feb 20, 2026
4ff0fff
Add OTLP traces headers to the actual HTTP requests
zacharycmontoya Feb 20, 2026
fe6d013
Add resource attribute "telemetry.sdk.name" to the OTLP traces
zacharycmontoya Feb 20, 2026
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1 change: 1 addition & 0 deletions tracer/missing-nullability-files.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ src/Datadog.Trace/TracerConstants.cs
src/Datadog.Trace/TracerManager.cs
src/Datadog.Trace/TracerManagerFactory.cs
src/Datadog.Trace/Agent/Api.cs
src/Datadog.Trace/Agent/ApiOtlp.cs
src/Datadog.Trace/Agent/ClientStatsPayload.cs
src/Datadog.Trace/Agent/IApi.cs
src/Datadog.Trace/Agent/IApiRequest.cs
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2 changes: 2 additions & 0 deletions tracer/src/Datadog.Trace.Tools.dd_dotnet/Datadog.Trace.Tools.dd_dotnet.csproj
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Expand Up @@ -55,9 +55,11 @@

<ItemGroup>
<Compile Include="..\Datadog.Trace\TracerConstants.cs" Link="TracerConstants.cs" />
<Compile Include="..\Datadog.Trace\Agent\TracesEncoding.cs" Link="TracesEncoding.cs" />
<Compile Include="..\Datadog.Trace\Agent\TracesTransportType.cs" Link="TracesTransportType.cs" />
<Compile Include="..\Datadog.Trace\Configuration\DeprecationMessages.cs" Link="DeprecationMessages.cs" />
<Compile Include="..\Datadog.Trace\Configuration\ExporterSettings.Shared.cs" Link="ExporterSettings.Shared.cs" />
<Compile Include="..\Datadog.Trace\Configuration\OtlpProtocol.cs" Link="OtlpProtocol.cs" />
<!-- Link to generated ConfigurationKeys from Datadog.Trace project -->
<Compile Include="..\Datadog.Trace\Generated\netstandard2.0\Datadog.Trace.SourceGenerators\ConfigurationKeysGenerator\ConfigurationKeys*.g.cs" LinkBase="Configuration" />
</ItemGroup>
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15 changes: 10 additions & 5 deletions tracer/src/Datadog.Trace/Agent/AgentWriter.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// <copyright file="AgentWriter.cs" company="Datadog">
// <copyright file="AgentWriter.cs" company="Datadog">
// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2017 Datadog, Inc.
// </copyright>
Expand All @@ -14,6 +14,7 @@
using Datadog.Trace.Configuration;
using Datadog.Trace.DogStatsd;
using Datadog.Trace.Logging;
using Datadog.Trace.OpenTelemetry.Traces;
using Datadog.Trace.Telemetry;
using Datadog.Trace.Telemetry.Metrics;

Expand Down Expand Up @@ -95,12 +96,16 @@ internal AgentWriter(IApi api, IStatsAggregator? statsAggregator, IStatsdManager
_batchInterval = batchInterval;
_traceKeepRateCalculator = traceKeepRateCalculator;

var formatterResolver = SpanFormatterResolver.Instance;
ISpanBufferSerializer spanBufferSerializer = api.TracesEncoding switch
{
TracesEncoding.OtlpJson => new OtlpTracesJsonSerializer(),
_ => new SpanBufferMessagePackSerializer(SpanFormatterResolver.Instance),
Comment on lines +101 to +102
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P1 Badge Avoid MessagePack serialization for OTLP protobuf mode

When TracesEncoding is OtlpProtobuf (for grpc/http/protobuf protocol settings), this switch falls back to SpanBufferMessagePackSerializer instead of an OTLP serializer. That causes OTLP protobuf configurations to emit Datadog MessagePack payloads, which OTLP collectors will not parse correctly.

Useful? React with 👍 / 👎.

};

_forceFlush = new TaskCompletionSource<bool>(TaskOptions);

_frontBuffer = new SpanBuffer(maxBufferSize, formatterResolver);
_backBuffer = new SpanBuffer(maxBufferSize, formatterResolver);
_frontBuffer = new SpanBuffer(maxBufferSize, spanBufferSerializer);
_backBuffer = new SpanBuffer(maxBufferSize, spanBufferSerializer);
_activeBuffer = _frontBuffer;

_apmTracingEnabled = apmTracingEnabled;
Expand All @@ -126,7 +131,7 @@ internal AgentWriter(IApi api, IStatsAggregator? statsAggregator, IStatsdManager

public bool CanComputeStats => _apmTracingEnabled && _statsAggregator?.CanComputeStats == true;

public Task<bool> Ping() => _api.SendTracesAsync(EmptyPayload, 0, false, 0, 0);
public Task<bool> Ping() => _api.Ping();

public void WriteTrace(in SpanCollection trace)
{
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7 changes: 6 additions & 1 deletion tracer/src/Datadog.Trace/Agent/Api.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// <copyright file="Api.cs" company="Datadog">
// <copyright file="Api.cs" company="Datadog">
// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2017 Datadog, Inc.
// </copyright>
Expand Down Expand Up @@ -31,6 +31,7 @@ internal sealed class Api : IApi
internal const string FailedToSendMessageTemplate = "An error occurred while sending data to the agent at {AgentEndpoint}. If the error isn't transient, please check https://docs.datadoghq.com/tracing/troubleshooting/connection_errors/?code-lang=dotnet for guidance.";

private static readonly IDatadogLogger StaticLog = DatadogLogging.GetLoggerFor<Api>();
private static readonly ArraySegment<byte> EmptyPayload = new([0x90]);

private readonly IDatadogLogger _log;
private readonly IApiRequestFactory _apiRequestFactory;
Expand Down Expand Up @@ -85,13 +86,17 @@ private enum SendResult
Failed_DontRetry,
}

public TracesEncoding TracesEncoding => TracesEncoding.DatadogV0_4;

[MemberNotNull(nameof(_statsd))]
public void ToggleTracerHealthMetrics(bool enabled)
{
Volatile.Write(ref _healthMetricsEnabled, enabled);
_statsd.SetRequired(StatsdConsumer.TraceApi, enabled);
}

public Task<bool> Ping() => SendTracesAsync(EmptyPayload, 0, false, 0, 0);

public Task<bool> SendStatsAsync(StatsBuffer stats, long bucketDuration)
{
_log.Debug("Sending stats to the Datadog Agent.");
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