- Traces show up in Jaeger with #[instrument] or span! Logs show up normally in stdout. Add README to explain how to set up.
- Structured logging as a flag + OT reporting to Jaeger.
- Batch exporting traces | version updates | UDP support | tracing flag | configure tracing url

- [x] add metrics
- [ ] configure sample rate
- [ ] B3 propagation

Added #229 for follow ups.