import type { AzureMonitorOpenTelemetryOptions } from "../types.js";
import { Sampler } from "@opentelemetry/sdk-trace-base";
/**
 * Azure Monitor OpenTelemetry Client Configuration through Env variables
 * @internal
 */
export declare class EnvConfig implements AzureMonitorOpenTelemetryOptions {
    /** The rate of telemetry items tracked that should be transmitted (Default 1.0) */
    samplingRatio?: number;
    /** The maximum number of spans to sample per second. (Default undefined)*/
    tracesPerSecond?: number;
    /** Custom OpenTelemetry sampler derived from env configuration */
    sampler?: Sampler;
    private static instance;
    /** Get Singleton instance */
    static getInstance(): EnvConfig;
    /**
     * Initializes a new instance of the EnvConfig class.
     */
    constructor();
    private _applyMicrosoftSampler;
    private _applyOtelSampler;
    private _parseProbability;
}
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