Anthropic cache metrics not reaching Langfuse exporter in streaming mode
TelemetryAgent
We're using
However, the cache token breakdown doesn't appear in our Langfuse traces or in the
We dug into the source and can see the full pipeline exists:
-
- The Langfuse exporter maps
- The Anthropic provider emits
It looks like the
Is this a known issue, or are we possibly missing something in our setup? Happy to provide more details if helpful.
@mastra/[email protected]@mastra/[email protected]@mastra/[email protected]claude-haiku-4-5-20251001cacheControl: { type: "ephemeral" }cache_creation_input_tokenscache_read_input_tokensHowever, the cache token breakdown doesn't appear in our Langfuse traces or in the
mastra_ai_spansinputTokensoutputTokensinputDetails.cacheReadinputDetails.cacheWriteWe dug into the source and can see the full pipeline exists:
-
extractUsageMetrics()@mastra/observabilityproviderMetadata.anthropic.cacheReadInputTokens- The Langfuse exporter maps
inputDetails.cacheReadcache_read_input_tokens- The Anthropic provider emits
cacheCreationInputTokensproviderMetadatamessage_stopIt looks like the
step-finishproviderMetadata#endStepSpan()metadata?.providerMetadataextractUsageMetricsagent.stream()maxSteps: 5Is this a known issue, or are we possibly missing something in our setup? Happy to provide more details if helpful.
