> ## Documentation Index
> Fetch the complete documentation index at: https://docs.appsignal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Multiple Rack libraries

export const VersionRequirements = ({versions = []}) => {
  if (!Array.isArray(versions) || versions.length === 0) {
    return null;
  }
  const boundaries = {
    upper: " or lower",
    exact: "",
    lower: " or higher"
  };
  const containerStyle = {
    marginTop: "0.5rem",
    marginBottom: "1.5rem"
  };
  const lineStyle = {
    display: "block",
    margin: "0 0 0.35rem 0",
    fontSize: "0.875rem",
    lineHeight: "1.4"
  };
  const pillBaseStyle = {
    display: "inline-block",
    padding: "0.1em 0.4em",
    borderRadius: "0.25rem",
    border: "1px solid",
    fontFamily: "ui-monospace, SFMono-Regular, Menlo, monospace",
    fontSize: "0.85em",
    fontWeight: 500
  };
  const pillColors = {
    "AppSignal for Elixir": {
      background: "#f3e8ff",
      borderColor: "#e9d5ff",
      color: "#9333ea"
    },
    "AppSignal for Front-end": {
      background: "#fef9c3",
      borderColor: "#fde68a",
      color: "#ca8a04"
    },
    "AppSignal for Go": {
      background: "#ccfbf1",
      borderColor: "#99f6e4",
      color: "#0d9488"
    },
    "AppSignal for JavaScript": {
      background: "#fef9c3",
      borderColor: "#fde68a",
      color: "#ca8a04"
    },
    "AppSignal for Node.js": {
      background: "#dcfce7",
      borderColor: "#bbf7d0",
      color: "#16a34a"
    },
    "AppSignal for Python": {
      background: "#dbeafe",
      borderColor: "#bfdbfe",
      color: "#2563eb"
    },
    "AppSignal for Ruby": {
      background: "#fee2e2",
      borderColor: "#fecaca",
      color: "#dc2626"
    },
    "AppSignal for Rust": {
      background: "#ffedd5",
      borderColor: "#fed7aa",
      color: "#ea580c"
    }
  };
  const defaultPillColor = {
    background: "#f4f4f5",
    borderColor: "#e4e4e7",
    color: "#52525b"
  };
  const getPillStyle = name => ({
    ...pillBaseStyle,
    ...pillColors[name] || defaultPillColor
  });
  const getBoundText = bound => {
    return boundaries[bound] || boundaries.lower;
  };
  return <div style={containerStyle}>
      {versions.map((v, i) => <p key={`${v.name}-${v.version}-${v.bound || "lower"}-${i}`} style={lineStyle}>
          This feature requires{" "}
          <code style={getPillStyle(v.name)}>{v.name}</code> version {v.version}
          {getBoundText(v.bound)}.
        </p>)}
    </div>;
};

<VersionRequirements
  versions={[
{ name: "AppSignal for Ruby", version: "3.12.0" }
]}
/>

If an application uses multiple Ruby web frameworks, like the ones listed below, follow this guide to set up instrumentation for all libraries.

* [Grape](/ruby/integrations/grape)
* [Hanami](/ruby/integrations/hanami)
* [Padrino](/ruby/integrations/padrino)
* [Sinatra](/ruby/integrations/sinatra)
* [Rails](/ruby/integrations/rails), no `Appsignal.load` required for Rails.

## Installation

For each library AppSignal should integrate with, call `Appsignal.load(:library_name)` where `:library_name` is replaced with the library name you want to instrument.

Follow the guides listed above for each library for additional steps per library and guidance on where to position each `Appsignal.load` call.

<CodeGroup>
  ```ruby Ruby theme={null}
  require "appsignal"

  Appsignal.load(:grape)
  Appsignal.load(:hanami)
  Appsignal.load(:padrino)
  Appsignal.load(:sinatra)

  Appsignal.start
  ```
</CodeGroup>

## Rack example app

For example, in an application that uses a lot of these Rack libraries:

<CodeGroup>
  ```ruby Ruby theme={null}
  # config.ru
  require "appsignal"

  Appsignal.load(:grape)

  require_relative "./app"

  Appsignal.load(:hanami)
  Appsignal.load(:padrino)
  Appsignal.load(:sinatra)

  Appsignal.start

  run MyApp.run
  ```
</CodeGroup>

## Rails app example

In a Rails app, add the loaders to the `config/application.rb` file.

<CodeGroup>
  ```ruby Ruby theme={null}
  # config/application.rb
  require_relative "boot"

  require "rails/all"

  Bundler.require(*Rails.groups)

  Appsignal.load(:sinatra)

  # ...
  ```
</CodeGroup>