LLM Observability spans do not appear in the platform; no links/attribution between APM spans and LLM Obs spans when payload >1MB to llmobs-intake.datadoghq.eu.

The LLM Observability intake endpoint (llmobs-intake.datadoghq.eu) rejects or fails to process payloads exceeding 1MB, despite dd-trace library (5MB) and Agent (5MB) limits allowing larger payloads locally. This prevents span ingestion and trace context linking/attribution.