Technologies/Express/express.nodejs.heap_size_used_bytes
ExpressExpressMetric

express.nodejs.heap_size_used_bytes

Used V8 heap size
Dimensions:None
Available on:PrometheusPrometheus (1)
Interface Metrics (1)
PrometheusPrometheus
Heap memory currently used by the process in bytes
Dimensions:None
Sources
nodejs_heap_size_used_bytesgithub.com

Technical Annotations (36)

Configuration Parameters (6)
resources.requests.memoryrecommended: 256Mi
Kubernetes memory request (guaranteed allocation)
resources.limits.memoryrecommended: 512Mi
Kubernetes memory limit (maximum allowed)
resources.requests.cpurecommended: 250m
Kubernetes CPU request (guaranteed allocation)
resources.limits.cpurecommended: 500m
Kubernetes CPU limit (maximum allowed)
vm.oom_kill_allocating_taskrecommended: 1
ensures OOM killer targets the allocating process, not random system processes
package-lock.jsonrecommended: properly locked versions
prevents version drift and ensures consistent dependency performance
CLI Commands (9)
node --inspect app.jsdiagnostic
node --prof app.jsdiagnostic
node --prof-process isolate-*.log > profile.txtdiagnostic
sudo sysctl -premediation
const fs = require('fs'); const readStream = fs.createReadStream('large-file.txt'); readStream.on('data', chunk => { console.log(`Received ${chunk.length} bytes`); });remediation
npm lsdiagnostic
npm auditdiagnostic
npm deduperemediation
node --inspect your-app.jsdiagnostic
Technical References (21)
Socket.IOcomponentremoveAllListenerscomponentgarbage collectionconceptOOM killconceptV8 GCcomponentNode.js single threadconceptheap_size_used_bytescomponent/etc/sysctl.conffile pathsyslogfile pathstreamcomponentfs.createReadStreamcomponentbackpressureconceptmoment.jscomponentdate-fnscomponentdayjscomponentfast-json-stringifycomponent--inspectcomponentChrome DevToolscomponentheap snapshotsconceptstop-the-worldconceptevent loopconcept
Related Insights (10)
Uncleaned event listeners cause memory leak leading to OOM crashcritical
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Missing Kubernetes resource limits cause OOM killscritical
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Memory leaks causing progressive performance degradationwarning
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Memory leak in long-running Node.js Express applicationscritical
▸
Memory exhaustion causes complete system lockupcritical
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Large file processing causes memory exhaustion and event loop lagwarning
▸
Heavy third-party dependencies bloat application and degrade performancewarning
▸
Memory leaks indirectly cause event loop lagwarning
▸
GC pauses cause stop-the-world event-loop stallswarning
▸
Memory leaks cause garbage collection pauses and event loop latencywarning
▸