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e03ed9b387
Adds comprehensive OpenTelemetry instrumentation for better observability: Tracing: - HTTP requests via @opentelemetry/instrumentation-http - NestJS controllers via @opentelemetry/instrumentation-nestjs-core - Redis operations via @opentelemetry/instrumentation-ioredis - BullMQ job queues via bullmq-otel - Database queries via Kysely log callback with accurate timing - File operations (send, stream, read) - Media processing (thumbnails, thumbhash, EXIF operations) - Metadata extraction Metrics: - Database connection pool usage (used/idle connections) The SDK is initialized in telemetry-preload.ts which is preloaded via --require before the main app starts. This ensures http instrumentation hooks are in place before any http module is imported. Enable tracing by setting OTEL_EXPORTER_OTLP_ENDPOINT environment variable. Also adds TraceContext to IBaseJob for future distributed trace propagation across BullMQ job boundaries.