tracing

The tracing crate is the modern standard for instrumentation in async Rust. It provides structured logging with spans (representing work) and events (point-in-time records). Spans can be nested, creating a tree that represents causality. I instrument

Once services talk to other services, logs alone don’t tell you where time goes. I like OpenTelemetry because it’s vendor-neutral: export to Honeycomb, Datadog, Tempo—whatever your team uses. I keep the initial setup minimal: instrument http, express,

To get useful traces, you need propagation and a real exporter. I set a global TextMapPropagator (TraceContext + Baggage) so inbound headers connect spans across services. Then I configure an OTLP exporter and a batch span processor so tracing overhea