---
title: "DenoRuntimeMetrics"
description: "Collect Deno runtime health metrics such as memory usage and process uptime."
url: https://docs.sentry.io/platforms/javascript/guides/deno/configuration/integrations/denoruntimemetrics/
---

# DenoRuntimeMetrics | Sentry for Deno

This integration only works in the Deno runtime.

*Import name: `Sentry.denoRuntimeMetricsIntegration`*

The `denoRuntimeMetricsIntegration` periodically collects Deno runtime health metrics and sends them to Sentry. Metrics include memory usage and process uptime.

```javascript
import * as Sentry from "@sentry/deno";

Sentry.init({
  dsn: "___PUBLIC_DSN___",
  integrations: [Sentry.denoRuntimeMetricsIntegration()],
});
```

## [Default Metrics](https://docs.sentry.io/platforms/javascript/guides/deno/configuration/integrations/denoruntimemetrics.md#default-metrics)

The following metrics are emitted every 30 seconds by default:

| Metric                        | Type    | Unit   | Description                                         |
| ----------------------------- | ------- | ------ | --------------------------------------------------- |
| `deno.runtime.mem.rss`        | gauge   | byte   | Resident Set Size — actual process memory footprint |
| `deno.runtime.mem.heap_used`  | gauge   | byte   | V8 heap currently in use                            |
| `deno.runtime.mem.heap_total` | gauge   | byte   | Total V8 heap allocated                             |
| `deno.runtime.process.uptime` | counter | second | Cumulative process uptime                           |

Unlike the [Node.js equivalent](https://docs.sentry.io/platforms/javascript/guides/node/configuration/integrations/noderuntimemetrics.md), CPU and event loop metrics are not available because Deno does not expose `process.cpuUsage()`, `performance.eventLoopUtilization()`, or `monitorEventLoopDelay`.

## [Options](https://docs.sentry.io/platforms/javascript/guides/deno/configuration/integrations/denoruntimemetrics.md#options)

### [`collect`](https://docs.sentry.io/platforms/javascript/guides/deno/configuration/integrations/denoruntimemetrics.md#collect)

*Type: `object`*

Configure which metrics to collect. You can enable opt-in metrics or disable default ones.

**Opt-in metrics (off by default):**

```javascript
Sentry.denoRuntimeMetricsIntegration({
  collect: {
    memExternal: true, // deno.runtime.mem.external
  },
});
```

**Disabling default metrics:**

```javascript
Sentry.denoRuntimeMetricsIntegration({
  collect: {
    uptime: false,
  },
});
```

### [`collectionIntervalMs`](https://docs.sentry.io/platforms/javascript/guides/deno/configuration/integrations/denoruntimemetrics.md#collectionintervalms)

*Type: `number`*

The interval in milliseconds between metric collections. Defaults to `30000` (30 seconds).

```javascript
Sentry.denoRuntimeMetricsIntegration({
  collectionIntervalMs: 60_000,
});
```