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Flush LLM Obs intake writer synchronously in serverless environments #12249

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Flush LLM Obs intake writer synchronously in serverless environments #12249

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4196c21
Emit LLM Obs spans over the intake track when using DDAgentWriter
purple4reina Aug 20, 2026
487006b
Flush the DDIntakeWriter track instead of adding a second LLM Obs writer
purple4reina Aug 24, 2026
b83d309
Clarify alwaysFlush comment refers to Lambda, not serverless generally
purple4reina Aug 25, 2026
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8 changes: 8 additions & 0 deletions dd-trace-core/src/main/java/datadog/trace/common/writer/WriterFactory.java
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Original file line number Diff line number Diff line change
Expand Up @@ -140,13 +140,21 @@ public static Writer createWriter(
final RemoteApi remoteApi =
createDDIntakeRemoteApi(config, commObjects, featuresDiscovery, trackType);

// In Lambda the execution environment can freeze as soon as the handler returns, before
// this writer's periodic flush timer next fires -- flush synchronously so buffered events
// (e.g. LLM Observability spans) aren't lost when that happens.
boolean alwaysFlush =
config.isAgentConfiguredUsingDefault()
&& ServerlessInfo.get().isRunningInServerlessEnvironment();

DDIntakeWriter.DDIntakeWriterBuilder builder =
DDIntakeWriter.builder()
.addTrack(trackType, remoteApi)
.prioritization(prioritization)
.healthMetrics(healthMetrics)
.monitoring(commObjects.monitoring)
.singleSpanSampler(singleSpanSampler)
.alwaysFlush(alwaysFlush)
.flushIntervalMilliseconds(flushIntervalMilliseconds);

if (config.isCiVisibilityEnabled()) {
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