@loopback/docs/site/apidocs/metrics.metricscomponent._constructor_.md

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---
lang: en
title: 'API docs: metrics.metricscomponent._constructor_'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/metrics
permalink: /doc/en/lb4/apidocs.metrics.metricscomponent._constructor_.html
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[Home](./index.md) &gt; [@loopback/metrics](./metrics.md) &gt; [MetricsComponent](./metrics.metricscomponent.md) &gt; [(constructor)](./metrics.metricscomponent._constructor_.md)

## MetricsComponent.(constructor)

Constructs a new instance of the `MetricsComponent` class

**Signature:**

```typescript
constructor(application: Application, metricsConfig?: MetricsConfig);
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

application


</td><td markdown="1">

[Application](./core.application.md)


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

metricsConfig


</td><td markdown="1">

[MetricsConfig](./metrics.metricsconfig.md)


</td><td markdown="1">

_(Optional)_


</td></tr>
</tbody></table>