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Ruby Rack integration for Grafana Cloud

The Rack webserver interface for Ruby allows easily building web applications. This integration enables the agent to send metrics to Grafana Cloud along with a useful default dashboard for visualization.

This integration includes 1 pre-built dashboard to help monitor and visualize Ruby Rack metrics.

Before you begin

This integration monitors a Rack web application (e.g. any Sinatra or Rails application) using the Collector middleware included in the Ruby Prometheus client library.

To get started, add the Prometheus client library to your Gemfile:

rb Copy

gem 'prometheus-client'

Then change the config.ru file of your Rack application to use the Prometheus Collector and Exporter middlewares before running your app:

rb Copy

require 'prometheus/middleware/collector'
require 'prometheus/middleware/exporter'

use Prometheus::Middleware::Collector
use Prometheus::Middleware::Exporter

run Sinatra::Application

You can refer to this example Sinatra app for a complete setup of the Prometheus client library.

Install Ruby Rack integration for Grafana Cloud

1. In your Grafana Cloud stack, click Connections in the left-hand menu.
2. Find Ruby Rack and click its tile to open the integration.
3. Review the prerequisites in the Configuration Details tab and set up Grafana Agent to send Ruby Rack metrics to your Grafana Cloud instance.
4. Click Install to add this integration’s pre-built dashboard to your Grafana Cloud instance, and you can start monitoring your Ruby Rack setup.

Configuration snippets for Grafana Alloy

Simple mode

These snippets are configured to scrape a single Ruby Rack instance running locally with default ports.

First, manually copy and append the following snippets into your alloy configuration file.

Metrics snippets

alloy Copy

discovery.relabel "metrics_integrations_integrations_ruby_rack" {
	targets = [{
		__address__ = "localhost:9292",
	}]

	rule {
		target_label = "instance"
		replacement  = constants.hostname
	}
}

prometheus.scrape "metrics_integrations_integrations_ruby_rack" {
	targets    = discovery.relabel.metrics_integrations_integrations_ruby_rack.output
	forward_to = [prometheus.remote_write.metrics_service.receiver]
	job_name   = "integrations/ruby-rack"
}

Advanced mode

The following snippets provide examples to guide you through the configuration process.

To instruct Grafana Alloy to scrape your Ruby Rack instances, manually copy and append the snippets to your alloy configuration file, then follow subsequent instructions.

Advanced metrics snippets

alloy Copy

discovery.relabel "metrics_integrations_integrations_ruby_rack" {
	targets = [{
		__address__ = "localhost:9292",
	}]

	rule {
		target_label = "instance"
		replacement  = constants.hostname
	}
}

prometheus.scrape "metrics_integrations_integrations_ruby_rack" {
	targets    = discovery.relabel.metrics_integrations_integrations_ruby_rack.output
	forward_to = [prometheus.remote_write.metrics_service.receiver]
	job_name   = "integrations/ruby-rack"
}

To monitor your Ruby Rack instance, you must use a discovery.relabel component to discover your Ruby Rack Prometheus endpoint and apply appropriate labels, followed by a prometheus.scrape component to scrape it.

Configure the following properties within each discovery.relabel component:

• __address__: The address to your Ruby Rack Prometheus metrics endpoint.
• instance label: constants.hostname sets the instance label to your Grafana Alloy server hostname. If that is not suitable, change it to a value uniquely identifies this Ruby Rack instance.

If you have multiple Ruby Rack servers to scrape, configure one discovery.relabel for each and scrape them by including each under targets within the prometheus.scrape component.

Grafana Agent static configuration (deprecated)

The following section shows configuration for running Grafana Agent in static mode which is deprecated. You should use Grafana Alloy for all new deployments.

Instructions for Grafana Agent static

Dashboards

The Ruby Rack integration installs the following dashboards in your Grafana Cloud instance to help monitor your system.

• Ruby Rack application overview

Ruby Rack Overview

Metrics

The most important metrics provided by the Ruby Rack integration, which are used on the pre-built dashboard, are as follows:

• http_server_request_duration_seconds_bucket
• http_server_request_duration_seconds_count
• http_server_request_duration_seconds_sum
• http_server_requests_total
• up

Changelog

md Copy

# 1.0.0 - February 2024

* Update mixin to replace all Angular panels with React based panels.

# 0.0.4 - September 2023

* New Filter Metrics option for configuring the Grafana Agent, which saves on metrics cost by dropping any metric not used by this integration. Beware that anything custom built using metrics that are not on the snippet will stop working.
* New hostname relabel option, which applies the instance name you write on the text box to the Grafana Agent configuration snippets, making it easier and less error prone to configure this mandatory label.

# 0.0.3 - September 2022

* Update dashboard panels descriptions.

# 0.0.2 - October 2021

* Update mixin to latest version:
  - Update queries to use $__rate_interval

# 0.0.1 - February 2021

* Initial release

Cost

By connecting your Ruby Rack instance to Grafana Cloud, you might incur charges. To view information on the number of active series that your Grafana Cloud account uses for metrics included in each Cloud tier, see Active series and dpm usage and Cloud tier pricing.