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Monitoring Node.js: Key Metrics You Should Track
Understand which metrics matter in Node.js applications, why they’re important, and how to track them effectively in production.
Good metrics transform vague complaints into actionable data points like "the payment service is experiencing 500ms response times, up from a 120ms baseline." MetricWarning ThresholdCritical ThresholdWhat It MeansEvent Loop Lag> 100ms> 500msThe application is struggling to process callbacks quickly enoughCPU Usage> 70% sustained> 90% sustainedApproaching CPU limitsMemory GrowthSteady increase over hoursNear heap limitPossible memory leak Runtime metrics show how Node.js is performing. Set dynamic thresholds based on time of day Alert on sudden changes rather than fixed values Detect when metrics deviate from historical patterns
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