Fix rubocop offenses

config/environments/production.rb

@@ -83,7 +83,7 @@ Rails.application.configure do
   config.active_support.deprecation = :notify
 
   # Use default logging formatter so that PID and timestamp are not suppressed.
-  config.log_formatter = ::Logger::Formatter.new
+  config.log_formatter = Logger::Formatter.new
 
   # Use a different logger for distributed setups.
   # require 'syslog/logger'

config/environments/staging.rb

@@ -101,7 +101,7 @@ Rails.application.configure do
   config.active_support.disallowed_deprecation_warnings = []
 
   # Use default logging formatter so that PID and timestamp are not suppressed.
-  config.log_formatter = ::Logger::Formatter.new
+  config.log_formatter = Logger::Formatter.new
 
   # Use a different logger for distributed setups.
   # require 'syslog/logger'

config/initializers/prometheus.rb

@@ -3,7 +3,7 @@
 require 'code_ocean/config'
 require 'prometheus/record'
 
-return unless CodeOcean::Config.new(:code_ocean).read[:prometheus_exporter][:enabled] && !defined?(::Rails::Console)
+return unless CodeOcean::Config.new(:code_ocean).read[:prometheus_exporter][:enabled] && !defined?(Rails::Console)
 return if %w[db: assets:].any? {|task| Rake.application.top_level_tasks.to_s.include?(task) }
 
 # Add metric callbacks to all models