View Source AppSignal for Elixir

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AppSignal for Elixir monitors errors, performance and servers for Elixir applications.


Please follow the installation guide on how to install and use this library.

Then, add custom instrumentation or use one of the framework integrations to automatically gain performance insights and error notifications. Currently, AppSignal has framework integrations for Plug and Phoenix and applications.


AppSignal will automatically monitor requests, report any exceptions that are thrown and any performance issues that might have occurred.

You can also add extra information to requests by adding custom instrumentation. Read more in our instrumentation guide.


A complete list of all configurable options for AppSignal for Elixir is available in our documentation.



Before you can start developing on the AppSignal for Elixir project make sure you have Elixir installed.

This repository is managed by mono. Install mono on your local machine by following the mono installation steps.

Then make sure you have all the project's dependencies installed by running the following command:

$ mono bootstrap


Testing is done with ExUnit and can be run with the mix test command. You can also supply a path to a specific file path you want to test and even a specific line on which the test you want to run is defined.

$ mono test
# The original command can still be used
$ mix test
$ mix test test/appsignal/some_test.ex:123

This project has several different test suites defined with different mix environments. You can run them by specifying the specific type of test suite in the MIX_ENV environment variable.

# Default
$ MIX_ENV=test mix test

# Run the test suite with the NIF inoperational. This will generate errors
# because the NIF is not active, but should run without failures.
$ MIX_ENV=test_no_nif mix test


This package uses benchee to benchmark code. To run the benchmarker:

$ MIX_ENV=bench mix run bench/<file>.exs


A memory testing setup is included to detect memory errors in the NIF. It's set up in a Docker container to ensure reproducability.

To run the tests, build the container, which will build a version of the NIF with AddressSanitizer enabled. Then, run it with an APPSIGNAL_PUSH_API_KEY and APPSIGNAL_APP_NAME set to ensure AppSignal is enabled, and to be able to verify that data appears in AppSignal after running the test:

docker build --platform linux/amd64 -t appsignal-elixir-asan .
docker run \
  --env APPSIGNAL_PUSH_API_KEY=00000000-0000-0000-0000-000000000000 \
  --env APPSIGNAL_APP_NAME="appsignal-elixir" \
  --rm \
  -- \

This test runs spans.exs, which is a script that calls most functions in the NIF.

Branches and versions

The main branch corresponds to the current release of the library. The develop branch is used for development of features that will end up in the next minor release. If you fix a bug open a pull request on main, if it's a new feature on develop.

Making changes

When making changes to the project that require a release, add a changeset that will be used to update the generated file upon release.

$ mono changeset add

Publishing new versions

  1. Merge the develop branch to main if necessary.

Updating the CI build matrix

  1. Update .semaphore/versions.rb to add or remove Elixir/OTP versions, or .semaphore/semaphore.yml.erb.
  2. Run script/generate_ci_matrix.


Thinking of contributing to our Elixir package? Awesome! 🚀

Please follow our Contributing guide in our documentation and follow our Code of Conduct.

Also, we would be very happy to send you Stroopwafles. Have look at everyone we send a package to so far on our Stroopwafles page.


Contact us and speak directly with the engineers working on AppSignal. They will help you get set up, tweak your code and make sure you get the most out of using AppSignal.

Also see our file.


The AppSignal for Elixir package source code is released under the MIT License. Check the LICENSE file for more information.