export interface MemberMetrics {
    invocations: number;
    successes: number;
    failures: number;
    totalDurationMs: number;
    lastRun: string | null;
}
export interface MetricsEntry {
    member: string;
    metrics: MemberMetrics;
}
export declare class MetricsCollector {
    private metricsDir;
    constructor(metricsDir: string);
    record(member: string, success: boolean, durationMs: number): void;
    getStats(member: string): MemberMetrics | null;
    getAllStats(): MetricsEntry[];
    getStaleMembers(maxDays: number): MetricsEntry[];
    getSuccessRate(member: string): number | null;
    getAverageDuration(member: string): number | null;
    clear(member: string): void;
    private emptyMetrics;
}
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