notifications_custom_instrumentation

🎺 Build Custom Instrumentation with ActiveSupport::Notifications

Use ActiveSupport::Notifications to instrument and subscribe to events for advanced metrics. Wrap critical code paths for detailed performance insights, and publish to multiple listeners.

# Instrument an event
def process_data(data)
  ActiveSupport::Notifications.instrument("data.process", size: data.size) do
    # heavy computation
  end
end

# Subscribe and aggregate timings
ActiveSupport::Notifications.subscribe("data.process") do |name, start, finish, id, payload|
  duration = (finish - start) * 1000
  MetricsLogger.log("ProcessData", duration, payload)
end

Combine with StatsD or Prometheus exporters to track custom Rails events.