import type { Attributes } from "@opentelemetry/api";
import type { TriggerTracerSpanEvent } from "../tracer.js";
import type { RunTimelineMetric, RunTimelineMetricsManager } from "./types.js";
export declare class RunTimelineMetricsAPI implements RunTimelineMetricsManager {
    #private;
    private static _instance?;
    private constructor();
    static getInstance(): RunTimelineMetricsAPI;
    registerMetric(metric: RunTimelineMetric): void;
    getMetrics(): RunTimelineMetric[];
    /**
     * Measures the execution time of an async function and registers it as a metric
     * @param metricName The name of the metric
     * @param eventName The event name
     * @param attributesOrCallback Optional attributes or the callback function
     * @param callbackFn The async function to measure (if attributes were provided)
     * @returns The result of the callback function
     */
    measureMetric<T>(metricName: string, eventName: string, attributesOrCallback: Attributes | (() => Promise<T>), callbackFn?: () => Promise<T>): Promise<T>;
    convertMetricsToSpanEvents(): TriggerTracerSpanEvent[];
    convertMetricsToSpanAttributes(): Attributes;
    setGlobalManager(manager: RunTimelineMetricsManager): boolean;
}