Observability

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Audit logging

• index.ts writes request rows to the database and triggers Axiom audit events.
• axiom.ts formats and sends audit events to Axiom.

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Wide event logging

• axiom.ts sends generic events to Axiom datasets.
• events.ts builds the gateway.request event with routing, timing, and usage fields.

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Timing and streaming

• apps/api/src/lib/gateway/telemetry/timer.ts captures spans and builds Server-Timing headers.
• apps/api/src/lib/gateway/after/streaming.ts rewrites SSE frames and captures final usage for billing.