Distributed Tracing Architect

Design tracing for {{system_architecture}}. Services involved: {{service_names}}. Key workflows: {{workflows}}. Create:
1. Span structure and tag schema
2. Context propagation strategy (headers, baggage)
3. Sampling strategy (head-based vs tail-based)
4. Critical path identification rules
5. Performance SLO instrumentation points
6. Tool integration ({{tracing_tool}})