/**
 * Change-point detection for an anchor pattern's rate curve.
 *
 * Replaces the old `timestamp(max_over_time(deriv(...)))` approximation
 * with an actual range-query over the anchor's rate, a per-bucket slope
 * computation, and a simple max-derivative scan. Returns the inflection
 * timestamp AND a confidence label ('sharp' | 'soft' | 'inferred') the
 * caller uses to decide whether to engage the inferred_midpoint fallback
 * in the investigate spec.
 *
 * Sub-minute resolution on the demo env (which scrapes every 15–30s) is
 * the practical limit — the detector picks the bucket whose local slope
 * maximum dominates, not a timestamp inside the bucket.
 */
import type { EnvConfig } from './environments.js';
export interface InflectionResult {
    /** UNIX seconds of the detected inflection (or window midpoint as fallback). */
    timestamp: number;
    /** Shape classification of the detection quality. */
    confidence: 'sharp' | 'soft' | 'inferred';
    /** Peak slope value at the detection point. */
    peakSlope: number;
    /** Ratio of peak slope to median slope — higher = sharper inflection. */
    peakToMedianRatio: number;
    /** Human-readable note for the investigation metadata. */
    note: string;
}
export declare function detectInflection(env: EnvConfig, metricsEnv: string, anchor: string, window: string, metricName?: string): Promise<InflectionResult>;