https://github.com/prometheus-erl/prometheus-cowboy

Expose Prometheus metrics using cowboy/cowboy2
https://github.com/prometheus-erl/prometheus-cowboy

cowboy erlang instrumentation monitoring prometheus

Last synced: about 6 hours ago
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Expose Prometheus metrics using cowboy/cowboy2

• Host: GitHub
• URL: https://github.com/prometheus-erl/prometheus-cowboy
• Owner: prometheus-erl
• License: mit
• Created: 2017-07-02T07:53:44.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2025-02-25T11:51:41.000Z (2 months ago)
• Last Synced: 2025-03-06T04:42:09.929Z (about 2 months ago)
• Topics: cowboy, erlang, instrumentation, monitoring, prometheus
• Language: Erlang
• Size: 2.26 MB
• Stars: 21
• Watchers: 4
• Forks: 19
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# prometheus_cowboy #

[![Hex.pm](https://img.shields.io/hexpm/v/prometheus_cowboy.svg?maxAge=2592000?style=plastic)](https://hex.pm/packages/prometheus_cowboy)

[![Hex.pm](https://img.shields.io/hexpm/dt/prometheus_cowboy.svg?maxAge=2592000)](https://hex.pm/packages/prometheus_cowboy)

[![Hex

Docs](https://img.shields.io/badge/hex-docs-lightgreen.svg)](https://hexdocs.pm/prometheus_cowboy/)

[![GitHub Actions](https://github.com/prometheus-erl/prometheus-cowboy/actions/workflows/ci.yml/badge.svg)](https://github.com/prometheus-erl/prometheus-cowboy/actions/workflows/ci.yml)

[![Codecov](https://codecov.io/github/prometheus-erl/prometheus-cowboy/graph/badge.svg?token=G9HB5UKNIY)](https://codecov.io/github/prometheus-erl/prometheus-cowboy)

## Exporting metrics with handlers

Cowboy 1:

```erlang

Routes = [

          {'_', [

                 {"/metrics/[:registry]", prometheus_cowboy1_handler, []},

                 {"/", toppage_handler, []}

                ]}

         ]

```

Cowboy 2:

```erlang

Routes = [

          {'_', [

                 {"/metrics/[:registry]", prometheus_cowboy2_handler, []},

                 {"/", toppage_handler, []}

                ]}

         ]

```

## Exporting Cowboy2 metrics

```erlang

    {ok, _} = cowboy:start_clear(http, [{port, 0}],

                                 #{env => #{dispatch => Dispatch},

                                   metrics_callback => fun prometheus_cowboy2_instrumenter:observe/1,

                                   stream_handlers => [cowboy_metrics_h, cowboy_stream_h]})

```