Airbrake config example (they made it a bit harder each version tbh)

z_airbrake.rb

Airbrake.configure do |config|
  # project specific
  config.project_key         = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

  # use git SHA & current commit as app version
  # Looks like this:
  #  Ruby: 2.7.0 » Rails: 6.0.2.2 » f98b36585 - Only try to remove fade from modals if jQuery is there
  config.app_version         = "Ruby: #{RUBY_VERSION} » Rails: #{Rails::VERSION::STRING} » " << `cd #{Rails.root} && git log -1 --pretty="%h - %B" HEAD`

  # can always be 1
  config.project_id          = 1

  # errbit host, always the same
  config.host                = 'https://err.example.net'

  # ignore exceptions in test/dev
  config.ignore_environments = %w[development test]

  # set app root directory
  config.root_directory      = Rails.root

  # set current environment
  config.environment         = Rails.env

  # log to own file
  config.logger              = Logger.new(Rails.root.join("log/airbrake.log"))

  # filter_parameter_logging.rb must run first! This is why this file starts with z_
  config.blacklist_keys      = Rails.application.config.filter_parameters

  # disable features errbit cannot handle (and spams log)
  config.job_stats           = false
  config.query_stats         = false
  config.performance_stats   = false
end



# ==========================
# = Annotate notifications =
# ==========================

# A filter that collects request body information. Enable it if you are sure you
# don't send sensitive information to Airbrake in your body (such as passwords).
# https://github.com/airbrake/airbrake#requestbodyfilter
Airbrake.add_filter(Airbrake::Rack::RequestBodyFilter.new)

# Annotate via filter
Airbrake.add_filter do |notice|
  # you might want to look deeper into what notice contains in your case,
  # the following things are somewhat project-specific.
  ctx = notice[:context]

  # remove thread shit from params hash
  notice[:params].delete(:thread)

  # add link to user
  if uid = ctx.dig(:user, :id)
    ctx[:user][:backend_link] = "https://www.example.com/admin/users/#{uid}"
  end

  # add headers to environment
  if headers = ctx[:headers]
    headers.each do |k,v|
      nk = k.to_s.gsub(".", "_").upcase
      next if AIRBRAKE_IGNORE_ENV.include?(nk)
      notice[:environment][nk] = v.to_s
    end
  end

  # add request env to environment *sigh*
  if env = notice.stash[:rack_request]&.env
    env.each do |k,v|
      nk = k.to_s.gsub(".", "_").upcase
      next if AIRBRAKE_IGNORE_ENV.include?(nk)
      notice[:environment][nk] = v.to_s
    end
  end

  # cleanup env hash
  notice[:environment] = notice[:environment].reject{|k,v| v.blank? }.sort_by{|k, v| k.to_s }.to_h
end



# =========================
# = Ignore exceptions/env =
# =========================
AIRBRAKE_IGNORE_ENV = [
  'ACTION_CONTROLLER_INSTANCE',
  'ACTION_DISPATCH_BACKTRACE_CLEANER',
  'ACTION_DISPATCH_COOKIES',
  'ACTION_DISPATCH_COOKIES_DIGEST',
  'ACTION_DISPATCH_COOKIES_SERIALIZER',
  'ACTION_DISPATCH_ENCRYPTED_COOKIE_SALT',
  'ACTION_DISPATCH_ENCRYPTED_SIGNED_COOKIE_SALT',
  'ACTION_DISPATCH_HTTP_AUTH_SALT',
  'ACTION_DISPATCH_KEY_GENERATOR',
  'ACTION_DISPATCH_LOGGER',
  'ACTION_DISPATCH_ROUTES',
  'ACTION_DISPATCH_SECRET_KEY_BASE',
  'ACTION_DISPATCH_SECRET_TOKEN',
  'ACTION_DISPATCH_SIGNED_COOKIE_SALT',
  # 'RACK_ERRORS',
  # 'RACK_INPUT',
  # 'RACK_SESSION',
  # 'RACK_SESSION_OPTIONS',
]
AIRBRAKE_IGNORE_EXCEPTIONS = [
  'ActiveRecord::RecordNotFound',
  'ActionController::RoutingError',
  'ActionController::UnknownFormat',
  'ActionController::UnknownAction',
  #'AbstractController::ActionNotFound',
  #'ActionController::UnknownHttpMethod',
  'ActionController::InvalidAuthenticityToken',
  'Mime::Type::InvalidMimeType',
  #'CGI::Session::CookieStore::TamperedWithCookie',
]

# Ignore exceptions by class
Airbrake.add_filter do |notice|
  if notice[:errors].any? { |error| AIRBRAKE_IGNORE_EXCEPTIONS.include?(error[:type]) }
    notice.ignore!
  end
end

# Ignore utf8 errors on /search
Airbrake.add_filter do |notice|
  notice.ignore! if notice[:errors].any?{|error|
    error[:type] == "ActionController::BadRequest" &&
    (
      error[:message].to_s.downcase.start_with?("invalid query parameters: non utf-8 value:") ||
      error[:message].to_s.downcase.start_with?("invalid query parameters: invalid encoding for parameter") ||
      error[:message].to_s.downcase.start_with?("invalid path parameters: invalid encoding for parameter")
    )
  }
end