import { EventEmitter } from 'node:events';
import type { LifecycleAssessment, LifecycleStage } from '@contractspec/lib.lifecycle';
export type LifecyclePipelineEvent = {
    type: 'assessment.recorded';
    payload: {
        tenantId?: string;
        stage: LifecycleStage;
    };
} | {
    type: 'stage.changed';
    payload: {
        tenantId?: string;
        previousStage?: LifecycleStage;
        nextStage: LifecycleStage;
    };
} | {
    type: 'confidence.low';
    payload: {
        tenantId?: string;
        confidence: number;
    };
};
export interface LifecycleKpiPipelineOptions {
    meterName?: string;
    emitter?: EventEmitter;
    lowConfidenceThreshold?: number;
}
export declare class LifecycleKpiPipeline {
    private readonly assessmentCounter;
    private readonly confidenceHistogram;
    private readonly stageUpDownCounter;
    private readonly emitter;
    private readonly lowConfidenceThreshold;
    private readonly currentStageByTenant;
    constructor(options?: LifecycleKpiPipelineOptions);
    recordAssessment(assessment: LifecycleAssessment, tenantId?: string): void;
    on(listener: (event: LifecyclePipelineEvent) => void): void;
    private ensureStageCounters;
}