Configure structured JSON logging

This configuration is emulating what we do in HEY.

Gemfile

@@ -28,9 +28,10 @@ gem "redcarpet"
 gem "rouge"
 gem "jbuilder"
 
-# Telemetry
+# Telemetry and logging
 gem "sentry-ruby"
 gem "sentry-rails"
+gem "rails_structured_logging", bc: "rails-structured-logging"
 
 group :development, :test do
   gem "debug"

Gemfile.lock

@@ -1,3 +1,11 @@
+GIT
+  remote: https://github.com/basecamp/rails-structured-logging
+  revision: 0c2d45dd98c92156cc419e75cdad2aa903290d82
+  specs:
+    rails_structured_logging (0.2.0)
+      json
+      rails (>= 6.0.0)
+
 GIT
   remote: https://github.com/rails/rails.git
   revision: 5520bd835e3724ffafe3f719f9aafe951567f2f3
@@ -420,6 +428,7 @@ DEPENDENCIES
   propshaft
   puma (>= 5.0)
   rails!
+  rails_structured_logging!
   redcarpet
   rouge
   rqrcode

config/environments/production.rb

@@ -50,6 +50,9 @@ Rails.application.configure do
                                        .tap  { |logger| logger.formatter = ::Logger::Formatter.new }
                                        .then { |logger| ActiveSupport::TaggedLogging.new(logger) }
 
+  # Structured JSON logging
+  config.structured_logging.logger = ActiveSupport::Logger.new(STDOUT)
+
   # Prepend all log lines with the following tags.
   config.log_tags = [ :request_id ]