What is clinic.js for Node.js?
A free tool that diagnoses Node.js performance issues. clinic doctor does a quick health check, clinic flame generates flame graphs, and clinic bubbleprof profiles async operations. These visualize where the event loop is stuck.
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More FAQs in How to Monitor Event Loop Health in Node.js Production Apps
Use the built-in perf_hooks module to monitor event loop delay, APM tools like New Relic or Datadog for alerts, and clinic.js for diagnosis. Alert when event loop lag exceeds a threshold, and profile to find the blocking code.
A measure of how far behind the event loop is. If it is consistently behind, something is blocking it with synchronous code. It is a key production metric, since it directly reflects how responsive your server is to requests.
Alert when event loop lag exceeds a threshold, like 100ms. This catches blocking operations early, before they affect many users. Use APM tools like Datadog or New Relic to track and alert on event loop lag automatically.
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