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instrumentation_monitoring

📊 Instrumentation & Monitoring​

Use ActiveSupport::Notifications to measure mail performance and track failures. Subscribe to the deliver.action_mailer event to push metrics to Datadog or Prometheus.

# config/initializers/mailer_instrumentation.rb
ActiveSupport::Notifications.subscribe('deliver.action_mailer') do |*args|
  event = ActiveSupport::Notifications::Event.new(*args)
  Rails.logger.info "Mail delivered in #{event.duration.round(1)}ms to #{event.payload[:to]}"
  StatsD.increment('mailer.deliveries')
end