/**
 * Drift detection and slope-similarity correlation for log10x_investigate.
 *
 * Drift cases are structurally different from acute spikes: there is no
 * inflection to anchor lag analysis on. Instead, we compute the anchor's
 * slope (rate of change per week) and find co-drifters whose slope most
 * closely matches the anchor's. The output is a cohort of patterns
 * growing together, not a causal chain.
 */
import type { EnvConfig } from './environments.js';
import type { InvestigateThresholds } from './thresholds.js';
export interface DriftResult {
    anchor: string;
    anchorSlopePerWeek: number;
    cohort: CoDrifter[];
    metadata: {
        patternsAnalyzed: number;
        queriesExecuted: number;
        wallTimeMs: number;
    };
}
export interface CoDrifter {
    pattern: string;
    service: string;
    severity: string;
    slopePerWeek: number;
    slopeSimilarity: number;
}
export interface DriftOptions {
    env: EnvConfig;
    metricsEnv: string;
    anchor: string;
    /** Window for slope computation. Typically wider than acute-spike window: "30d" or "90d". */
    window: string;
    depth: 'shallow' | 'normal' | 'deep';
    thresholds: InvestigateThresholds;
    scopeService?: string;
    anchorSeverity?: string;
    metricName?: string;
}
/**
 * Classify whether an anchor's trajectory is an acute spike, drift, or flat.
 * Returns the anchor's per-week growth rate for downstream use by the drift
 * flow, plus a simple shape classification.
 */
export declare function classifyTrajectory(env: EnvConfig, metricsEnv: string, anchor: string, window: string, thresholds: InvestigateThresholds, severity?: string, metricName?: string, baselineOffset?: string): Promise<{
    shape: 'acute' | 'drift' | 'flat';
    slopePerWeek: number;
    rateChange: number;
}>;
export declare function runDriftCorrelation(opts: DriftOptions): Promise<DriftResult>;
export declare function driftConfidence(anchorSlope: number, cohort: CoDrifter[], driftFloor: number): {
    slopeSig: number;
    cohortCoh: number;
    combined: number;
};