Affected Environments

All environments are affected by this issue

Symptom

No data appears in the Total LLM Cost chart when filtering by metadata fields.

Root Cause

• By default, trace-level metrics are disabled in Braintrust.

• When trace-level metrics are disabled, Braintrust uses span-level filtering instead of trace-level filtering.

• When filtering by metadata, only spans which pass the metadata filter are considered.

• Because cost data and metadata generally appear on different spans within the same trace, no data is returned in the chart.

Solution

Enable trace level metrics in Organization > Settings > Feature Flags > Trace level metrics