Technologies/Langfuse/langfuse.observation.count
LangfuseLangfuseMetric

langfuse.observation.count

Total observations created
Dimensions:None
Available on:PrometheusPrometheus (1)DynatraceDynatrace (1)
Interface Metrics (2)
PrometheusPrometheus
Total number of observations (spans, generations, events) created
Dimensions:None
DynatraceDynatrace
Total number of observations (spans, events, generations) created
Dimensions:None
Sources
langfuse_observations_totalgithub.com
langfuse.observation.countlangfuse.com

Technical Annotations (19)

Configuration Parameters (7)
LANGFUSE_INGESTION_CLICKHOUSE_WRITE_BATCH_SIZErecommended: 500
Reduces records per batch to lower memory usage and avoid oversized rows
LANGFUSE_INGESTION_CLICKHOUSE_WRITE_INTERVAL_MSrecommended: 100
Flushes batches more frequently to prevent large payload buildup
LANGFUSE_INGESTION_QUEUE_PROCESSING_CONCURRENCYrecommended: 10
Reduces concurrent jobs and memory pressure on workers
NODE_OPTIONSrecommended: --max-old-space-size=4096
Attempted but ineffective - does not prevent architectural memory issue
max_execution_time
ClickHouse setting to raise timeout limits for heavy queries
max_memory_usage
ClickHouse setting to allow more memory for analytical queries
memory_allocationrecommended: 16 GiB or more
Recommended ClickHouse memory for heavy analytical workloads
Error Signatures (4)
FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memoryexception
Mark-Compactlog pattern
Backend Service Overloaded Database resource limit exceeded. Please use more specific filters or a shorter time rangeerror code
Path: dashboard.executeQuerylog pattern
Technical References (8)
trajectory evaluationconceptintermediate stepscomponentobservationsconceptingestion workerscomponentotel directoryfile pathobservations tablecomponenttraces tablecomponentTrace latency percentiles panelcomponent
Related Insights (4)
Context or API results fail to propagate in LLM chainswarning
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Inaccurate intermediate steps cause complete agent system failurecritical
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High-cardinality traces (10K+ spans) cause Node.js heap exhaustion in ingestion workerscritical
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Dashboard query timeout on large observations table prevents trace latency panel loadingwarning
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