import { Counter, Gauge, Histogram, Registry } from 'prom-client';
import InstrumentedSemaphorePoolFactory, { MetricOptions } from './instrumented.js';
export default class PromSemaphorePoolFactory extends InstrumentedSemaphorePoolFactory {
    #private;
    constructor(opts?: MetricOptions | Registry, ...registries: Registry[]);
    addRegistry(registry: Registry): void;
    get metrics(): {
        requested: Counter<"pool" | "operation"> & {
            init(labels: Record<"pool" | "operation", string | number>): void;
        };
        settled: Counter<"pool" | "operation" | "outcome"> & {
            init(labels: Record<"pool" | "operation" | "outcome", string | number>): void;
        };
        released: Counter<"pool" | "operation"> & {
            init(labels: Record<"pool" | "operation", string | number>): void;
        };
        reserved: Gauge<"pool" | "operation">;
        queued: Gauge<"pool" | "operation">;
        concurrency: Gauge<"pool">;
        capacity: Gauge<"pool">;
        waittime: Histogram<"pool" | "operation" | "outcome">;
        heldtime: Histogram<"pool" | "operation">;
    };
}