# @libp2p/prometheus-metrics

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> Collect libp2p metrics for scraping by Prometheus or Graphana

# About

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Configure your libp2p node with Prometheus metrics:

```typescript
import { createLibp2p } from 'libp2p'
import { prometheusMetrics } from '@libp2p/prometheus-metrics'

const node = await createLibp2p({
  metrics: prometheusMetrics()
})
```

Then use the `prom-client` module to supply metrics to the Prometheus/Graphana client using your http framework:

```JavaScript
import client from 'prom-client'

async function handler (request, h) {
  return h.response(await client.register.metrics())
    .type(client.register.contentType)
}
```

All Prometheus metrics are global so there's no other work required to extract them.

## Queries

Some useful queries are:

### Data sent/received

```
rate(libp2p_data_transfer_bytes_total[30s])
```

### CPU usage

```
rate(process_cpu_user_seconds_total[30s]) * 100
```

### Memory usage

```
nodejs_memory_usage_bytes
```

### DHT query time

```
libp2p_kad_dht_wan_query_time_seconds
```

or

```
libp2p_kad_dht_lan_query_time_seconds
```

### TCP transport dialer errors

```
rate(libp2p_tcp_dialer_errors_total[30s])
```

# Install

```console
$ npm i @libp2p/prometheus-metrics
```

# API Docs

- <https://libp2p.github.io/js-libp2p/modules/_libp2p_prometheus_metrics.html>

# License

Licensed under either of

- Apache 2.0, ([LICENSE-APACHE](https://github.com/libp2p/js-libp2p/blob/main/packages/metrics-prometheus/LICENSE-APACHE) / <http://www.apache.org/licenses/LICENSE-2.0>)
- MIT ([LICENSE-MIT](https://github.com/libp2p/js-libp2p/blob/main/packages/metrics-prometheus/LICENSE-MIT) / <http://opensource.org/licenses/MIT>)

# Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.