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Fix recording open telemetry LLM metrics #1443

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Merged
merged 2 commits into from
Nov 16, 2025
Merged

Fix recording open telemetry LLM metrics #1443

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8d57821
Fix recording open telemetry LLM metrics
bartizan Nov 13, 2025
41b75ea
Merge branch 'main' into 1407_fix-recording-openai-otel-metrics
waldekmastykarz Nov 16, 2025
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17 changes: 13 additions & 4 deletions DevProxy.Plugins/Inspection/OpenAITelemetryPlugin.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -218,11 +218,20 @@ private void InitializeOpenTelemetryExporter()

try
{
void configureOtlpExporter(OtlpExporterOptions options)
var baseExporterUri = new Uri(Configuration.ExporterEndpoint);

void configureTracesOtlpExporter(OtlpExporterOptions options)
{
// We use protobuf to allow intercepting Dev Proxy's own LLM traffic
options.Protocol = OtlpExportProtocol.HttpProtobuf;
options.Endpoint = new Uri(baseExporterUri, "/v1/traces");
}

void configureMetricsOtlpExporter(OtlpExporterOptions options)
{
// We use protobuf to allow intercepting Dev Proxy's own LLM traffic
options.Protocol = OtlpExportProtocol.HttpProtobuf;
options.Endpoint = new Uri(Configuration.ExporterEndpoint + "/v1/traces");
options.Endpoint = new Uri(baseExporterUri, "/v1/metrics");
}

var resourceBuilder = ResourceBuilder
Expand All @@ -232,7 +241,7 @@ void configureOtlpExporter(OtlpExporterOptions options)
_tracerProvider = Sdk.CreateTracerProviderBuilder()
.SetResourceBuilder(resourceBuilder)
.AddSource(ActivitySourceName)
.AddOtlpExporter(configureOtlpExporter)
.AddOtlpExporter(configureTracesOtlpExporter)
.Build();

_meterProvider = Sdk.CreateMeterProviderBuilder()
Expand All @@ -247,7 +256,7 @@ void configureOtlpExporter(OtlpExporterOptions options)
Boundaries = [0.0001, 0.0005, 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 5, 10, 50, 100]
})
.AddView(SemanticConvention.GEN_AI_USAGE_TOTAL_COST, new MetricStreamConfiguration())
.AddOtlpExporter(configureOtlpExporter)
.AddOtlpExporter(configureMetricsOtlpExporter)
.Build();

_tokenUsageMetric = _meter.CreateHistogram<long>(
Expand Down