Langfuse — decommissioned 2026-07-09

Langfuse is gone. It was never migrated to Flagg, its traces API 429'd/422'd under real query load (2026-07 backup/self-healing token-drain post-mortem), and every code path was removed from this repo (grep -ri langfuse packages/ apps/ returns zero).

Where usage observability lives now

• CLI: joelclaw usage --hours 24 [--source router|agents|all] [--model X] [--machine Y] [--json]
• Query layer: packages/system-bus/src/lib/clickhouse-usage-query.ts over ClickHouse joelclaw.otel_events
• Router usage: model_router.result events carry a full usage object in metadata_json (fixed by passing --mode json to pi in inference.ts)
• Agent sessions: passive tailers (packages/system-bus/src/lib/agent-usage/) parse Pi/Claude Code/Codex transcripts into agent_usage.turn events every 15 min (system/agent-usage.scan)
• Pricing: packages/system-bus/src/lib/model-pricing.ts — provider-reported cost wins; OpenRouter public pricing is the benchmark fallback (pricing data only, never an inference path)
• Daily report: daily-token-usage-report.ts reads ClickHouse directly

Residue

• pi/extensions/langfuse-cost still exists but degrades to disabled telemetry (fails soft, by design). Superseded by the agent-usage tailers; removal is a pending follow-up.
• LANGFUSE_* secrets in the secrets store are unused and can be revoked.

Project receipts: .brain/projects/agent-usage-observability-2026-07-09.svx.