1. 1. Welcome
2. 2. Structured logging
3. 1. 2.1. The log crate
   2. 2.2. Log levels
   3. 2.3. What to log
   4. 2.4. The tracing crate
   5. 2.5. Fields
   6. 2.6. instrument macro
   7. 2.7. Structured output
   8. 2.8. OpenTelemetry
   9. 2.9. tracing subscribers
   10. 2.10. The lifecycle of a Span
   11. 2.11. Thread-local state
   12. 2.12. Instrumenting async code
   13. 2.13. Instrumenting async code #2
   14. 2.14. Interoperability
4. 3. Error handling
5. 1. 3.1. The Error trait
   2. 3.2. Error reporters
   3. 3.3. Panic handling
6. 4. Metrics
7. 1. 4.1. The metrics crate
   2. 4.2. Describe
   3. 4.3. Labels
   4. 4.4. Prometheus
   5. 4.5. Gauges
   6. 4.6. Histograms
   7. 4.7. Outro