allow log levels to be configurable via ENV

config/environments/development.rb

@@ -51,6 +51,10 @@ Rails.application.configure do
 
   config.action_mailer.perform_caching = false
 
+  # Use the lowest log level to ensure availability of diagnostic information
+  # when problems arise.
+  config.log_level = ENV.fetch("LOG_LEVEL") { "debug" }.to_sym
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 

config/environments/production.rb

@@ -45,7 +45,7 @@ Rails.application.configure do
 
   # Use the lowest log level to ensure availability of diagnostic information
   # when problems arise.
-  config.log_level = :debug
+  config.log_level = ENV.fetch("LOG_LEVEL") { "info" }.to_sym
 
   # Prepend all log lines with the following tags.
   config.log_tags = [ :request_id ]

config/environments/test.rb

@@ -34,6 +34,10 @@ Rails.application.configure do
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
+  # Use the lowest log level to ensure availability of diagnostic information
+  # when problems arise.
+  config.log_level = ENV.fetch("LOG_LEVEL") { "debug" }.to_sym
+
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr