import { Sampler, SamplingResult, Context, Attributes, Link } from '@opentelemetry/api';
import type { TelemetryConfig } from './config.js';
export declare class AdaptiveSampler implements Sampler {
    private sampler;
    private targetRate;
    private currentRate;
    private traceCount;
    private sampleCount;
    private lastReset;
    private resetInterval;
    constructor(targetRate: number, initialRate?: number);
    shouldSample(context: Context, traceId: string, spanName: string, spanKind: number, attributes: Attributes, _links: Link[]): SamplingResult;
    toString(): string;
    private updateStats;
}
export declare class AttributeBasedSampler implements Sampler {
    private baseSampler;
    private attributeRules;
    constructor(baseSampler: Sampler, attributeRules: Array<{
        attribute: string;
        value: string | RegExp;
        samplingRate: number;
    }>);
    shouldSample(context: Context, traceId: string, spanName: string, spanKind: number, attributes: Attributes, _links: Link[]): SamplingResult;
    toString(): string;
}
export declare function createSampler(config: TelemetryConfig): Sampler;
export declare function createEnhancedSampler(config: TelemetryConfig): Sampler;
export declare class PriorityBasedSampler implements Sampler {
    private baseSampler;
    private priorityAttribute;
    constructor(baseSampler: Sampler, priorityAttribute?: string);
    shouldSample(context: Context, traceId: string, spanName: string, spanKind: number, attributes: Attributes, _links: Link[]): SamplingResult;
    toString(): string;
}
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