Interface NodeRuntimeMetricsOptions

Which metrics to collect.

Default on (8 metrics):

• cpuUtilization — CPU utilization ratio
• memRss — Resident Set Size (actual memory footprint)
• memHeapUsed — V8 heap currently in use
• memHeapTotal — total V8 heap allocated (headroom paired with memHeapUsed)
• eventLoopDelayP50 — median event loop delay (baseline latency)
• eventLoopDelayP99 — 99th percentile event loop delay (tail latency / spikes)
• eventLoopUtilization — fraction of time the event loop was active
• uptime — process uptime (detect restarts/crashes)

Default off (opt-in):

• cpuTime — raw user/system CPU time in seconds
• memExternal — external/ArrayBuffer memory (relevant for native addons)
• eventLoopDelayMin / eventLoopDelayMax / eventLoopDelayMean / eventLoopDelayP90

How often to collect metrics, in milliseconds.