quodolores/docs-exp/performance.performancetrace.putmetric.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/performance](./performance.md) &gt; [PerformanceTrace](./performance.performancetrace.md) &gt; [putMetric](./performance.performancetrace.putmetric.md)

## PerformanceTrace.putMetric() method

Sets the value of the specified custom metric to the given number regardless of whether a metric with that name already exists on the trace instance or not. The value will be floored down to an integer.

<b>Signature:</b>

```typescript
putMetric(metricName: string, num: number): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  metricName | string | Name of the custom metric. |
|  num | number | Value to of the custom metric. |

<b>Returns:</b>

void