google-cloud-ruby: FATAL errors are not being displayed as ERROR on GCP stack driver

FATAL errors are being displayed as info logs instead of errors or warning logs.

My application.rb

# frozen_string_literal: true

require_relative 'boot'

require 'rails'
# Pick the frameworks you want:
require 'active_model/railtie'
# require "active_job/railtie"
# require "active_record/railtie"
require 'active_storage/engine'
require 'action_controller/railtie'
require 'action_mailer/railtie'
require 'action_view/railtie'
# require "action_cable/engine"
# require "sprockets/railtie"
require 'rails/test_unit/railtie'
require 'stackdriver'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

module AuthService
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 5.2

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.

    # Only loads a smaller set of middleware suitable for API only apps.
    # Middleware like session, flash, cookies can be added back manually.
    # Skip views, helpers and assets when generating a new resource.
    config.api_only = false
    config.eager_load_paths += %W[#{config.root}/app]
    config.time_zone = 'Etc/UTC'
    config.reload_controllers = !Rails.env.production?
  end
end

How can I change fatal errors to be ERRORs?