Backlogs of distributed tracing

[namkyu1999]

Choose one: FEATURE REQUEST

• [ ] phase 1: merge this pr, #706
• [ ] phase 2: Propagate trace context to helper pods
• [ ] phase 3: Add trace_id to logs
• [ ] phase 4: Enhance instrumentation coverage
  • [ ] span errors
  • [ ] span attributes
  • [ ] span events

Reference: Trace Semantic Conventions