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.
feat: Support config via Systemd Credentials
See https://systemd.io/CREDENTIALS/. This is used as a fallback, so will
only be used if the `$*_FILE` var is empty. This could also be used to
implicitly use Docker Secrets by settings
`CREDENTIALS_DIRECTORY=/run/secrets` rather than setting individual
`$_*FILE` environment variables.
midzelis