import { Registry, Counter, Histogram } from 'prom-client';
import type { KythiaLogger } from '../types';
export declare class MetricsManager {
    registry: Registry;
    logger: KythiaLogger;
    commandsTotal: Counter;
    commandDuration: Histogram;
    cacheOpsTotal: Counter;
    dbQueryDuration: Histogram;
    constructor({ logger }: {
        logger: KythiaLogger;
    });
    getMetrics(): Promise<string>;
    getContentType(): string;
}
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