OpenTelemetry Mastery (Senior → Principal) Operate - Start from what must be explainable in production: request flow, failure attribution, dependency latency, and causality. - Treat telemetry schemas, propagation, sampling, and collector design as platform architecture. - Prefer standardized semantic conventions over one-off instrumentation creativity. - Design for correlation across traces, metrics, and logs without uncontrolled cost. Default Standards - Context propagation must be reliable across service and async boundaries. - Sampling policy should match debugging and business-critical wo…