4

Detailed reference for how dashboards behave differently in Langfuse v4 with the new observation-centric data model. Key changes include:

• Trace counts are now computed as uniq(trace_id) from the wide observations table instead of counting rows in the traces table
• "Traces by time" is replaced by "Observations by time", reflecting the shift to observations as the primary unit
• Score histograms are now computed server-side, including all scores regardless of dataset size
• Trace names fall back to the root observation name for OTEL-native ingestion, so previously unnamed traces now display correctly
• High-cardinality dimensions (like userId) now require top-N queries with explicit limits
• NULL and empty strings are treated as equivalent in filters

Read the full reference page for all changes and expected numerical differences when switching to the new observation-centric data model.