/**
 * Latency Histogram
 *
 * Per-provider latency tracking with percentile computation.
 * Uses a sorted insertion ring buffer to keep memory bounded
 * while supporting efficient percentile queries.
 */
export interface LatencySummary {
    p50: number;
    p95: number;
    p99: number;
    min: number;
    max: number;
    mean: number;
    count: number;
}
export declare class LatencyHistogram {
    private buffers;
    private maxSamples;
    constructor(maxSamples?: number);
    /** Record a latency measurement for a provider (in milliseconds). */
    record(provider: string, latencyMs: number): void;
    /**
     * Compute a specific percentile for a provider.
     * @param p Percentile as a number between 0 and 100 (e.g. 95 for p95).
     * Returns 0 if no data.
     */
    percentile(provider: string, p: number): number;
    /** Get a full summary for a provider. */
    summary(provider: string): LatencySummary;
    /** Get summaries for all tracked providers. */
    allSummaries(): Record<string, LatencySummary>;
    /** Reset one or all providers. */
    reset(provider?: string): void;
}
/** Shared singleton. */
export declare const defaultLatencyHistogram: LatencyHistogram;
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