/**
 * Reports a custom metric to the current active span.
 *
 * This function allows you to add a custom metric to the current span in the trace.
 * If there is no active span, a warning will be logged.
 *
 * @param {string} metricName - The name of the custom metric.
 * @param {number} metricValue - The numeric value of the custom metric.
 *
 * @example
 * reportCustomMetric('processing_time', 150);
 */
export declare const reportCustomMetric: (metricName: string, metricValue: number) => void;
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