Tracer (otel)

otelのtracer

Trace Spanの生成と管理を担う

例

code:ts

import { Span, trace } from '@opentelemetry/api';

const tracer = trace.getTracer('usecase');

export function rollTheDice(rolls: number, min: number, max: number) {

return tracer.startActiveSpan('usecase:rollTheDice', async (span: Span) => {

const result = Array.from({ length: rolls }, (_, i) =>

rollOnce(i, min, max),

);

span.setAttribute('dice.result', result);

span.setAttribute('dice.count', result.length);

span.end();

return result;

});

}