express.eventloop.lag.max

Maximum event loop lag

Dimensions:None

Available on:

Prometheus (1)

Interface Metrics (1)

Prometheus

nodejs_eventloop_lag_max_seconds

Maximum recorded event loop lag in seconds

Dimensions:None

Sources

nodejs_eventloop_lag_max_secondsgithub.com

Technical Annotations (24)

Configuration Parameters (3)

prisma.transaction.timeoutrecommended: 5000

Default Prisma transaction timeout in milliseconds

thresholdrecommended: 100

Event loop delay threshold in ms for warning alerts

resolutionrecommended: 10

Resolution for monitorEventLoopDelay histogram in ms

Error Signatures (2)

Transaction already closed: A query cannot be executed on an expired transactionexception

Invalid `prisma.taskAttempt.create()` invocation: Transaction API errorexception

CLI Commands (8)

node --trace-sync-io app.jsdiagnostic

npx clinic doctor -- node app.jsdiagnostic

npm install -g 0xdiagnostic

0x app.jsdiagnostic

node --inspect your_app.jsdiagnostic

clinic doctor -- node your_app.jsdiagnostic

npm install event-loop-lagmonitoring

node --trace-sync-io server.jsdiagnostic

Technical References (11)

PM2componentevent loopconceptfs.readFileSynccomponentcrypto.pbkdf2SynccomponentPrismacomponentV8 profilercomponentprocess.hrtime.bigint()componentfs.readFilecomponentasync/awaitconceptperf_hookscomponentmonitorEventLoopDelaycomponent

Related Insights (10)

Event loop lag exceeds 10-20ms thresholdwarning

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Synchronous operations block event loop and tank throughputcritical

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Prisma transaction timeouts due to event loop blockingcritical

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High event loop lag degrades API responsivenesswarning

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Synchronous file I/O blocks event loop in productioncritical

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Event loop blocking causes complete application unresponsivenesscritical

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Event loop delay exceeding 100ms indicates blockingwarning

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Synchronous functions block event loop under high trafficwarning

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Event-loop stalls invisible without direct lag measurementcritical

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Event loop lag indicates delayed task executionwarning

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