import { Pool } from 'pg';
import { Metric } from 'prom-client';
import { DbLogger } from '../common';
/**
 * Creates a `Gauge` metric with the name `ax_postgres_<pgPoolType>_connectivity` which can be added to a metric Registry.
 * This metric will have a value of `1` if the Database can be reached via the corresponding Pool (within the given timeout),
 * or a value of `0` otherwise.
 *
 * @param pgPool The Postgres Pool to use for checking the connectivity. The connectivity test will be done at the point of metric collection.
 * @param pgPoolType The Postgres Pool to check connectivity for.
 * @param timeoutInMilliSeconds The maximum time the connectivity check will run during metric collection. Defaults to `10000ms`.
 * @returns A `Gauge` metric with a name `ax_postgres_<pgPoolType>_connectivity`.
 */
export declare const createPostgresPoolConnectivityMetric: (logger: DbLogger, pgPool: Pool, pgPoolType: "dbOwnerPool" | "envOwnerPool" | "loginPool", timeoutInMilliSeconds?: number) => Metric<string>;
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