[Home](./index.md) > [@firebase/performance](./performance.md) > [PerformanceTrace](./performance.performancetrace.md) > [getMetric](./performance.performancetrace.getmetric.md) ## PerformanceTrace.getMetric() method Returns the value of the custom metric by that name. If a custom metric with that name does not exist will return zero. Signature: ```typescript getMetric(metricName: string): number; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | metricName | string | Name of the custom metric. | Returns: number