2022-07-12 09:00:22 +02:00

30 lines
1.4 KiB
TypeScript

import { Context } from '../context/types';
import { SpanAttributes } from './attributes';
import { Link } from './link';
import { SamplingResult } from './SamplingResult';
import { SpanKind } from './span_kind';
/**
* This interface represent a sampler. Sampling is a mechanism to control the
* noise and overhead introduced by OpenTelemetry by reducing the number of
* samples of traces collected and sent to the backend.
*/
export interface Sampler {
/**
* Checks whether span needs to be created and tracked.
*
* @param context Parent Context which may contain a span.
* @param traceId of the span to be created. It can be different from the
* traceId in the {@link SpanContext}. Typically in situations when the
* span to be created starts a new trace.
* @param spanName of the span to be created.
* @param spanKind of the span to be created.
* @param attributes Initial set of SpanAttributes for the Span being constructed.
* @param links Collection of links that will be associated with the Span to
* be created. Typically useful for batch operations.
* @returns a {@link SamplingResult}.
*/
shouldSample(context: Context, traceId: string, spanName: string, spanKind: SpanKind, attributes: SpanAttributes, links: Link[]): SamplingResult;
/** Returns the sampler name or short description with the configuration. */
toString(): string;
}
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