Technologies/Express/express.eventloop.lag.p50
ExpressExpressMetric

express.eventloop.lag.p50

Median event loop lag
Dimensions:None
Available on:PrometheusPrometheus (1)
Interface Metrics (1)
PrometheusPrometheus
50th percentile (median) of event loop lag in seconds
Dimensions:None
Sources
nodejs_eventloop_lag_p50_secondsgithub.com

Technical Annotations (4)

Configuration Parameters (2)
thresholdrecommended: 100
Event loop blocking threshold in milliseconds
resolutionrecommended: 10
Histogram resolution for monitorEventLoopDelay in milliseconds
Technical References (2)
perf_hookscomponentmonitorEventLoopDelaycomponent
Related Insights (2)
Event loop delay exceeding 100ms indicates blockingwarning
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Event-loop stalls invisible without direct lag measurementcritical
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