What would you monitor for Virtual Threads (Project Loom) on-call?

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Quick interview answer

On-call for Virtual Threads (Project Loom): alert on lag/latency, error spikes, and saturation — with runbooks. Baseline: Virtual threads are lightweight; block on IO without pinning platform thread (mostly). Executors.newVirtualThreadPerTaskExecutor() simplifies massive concurrency.

Detailed answer

On-call monitoring for Virtual Threads (Project Loom): • Golden signals: latency, traffic, errors, saturation • Virtual Threads (Project Loom)-specific gauges (queue delay, pool wait, cache miss, etc.) • Alerting: burn-rate / multi-window so pages are actionable • Runbook: mitigate → diagnose → escalate Parent context: Baseline: Virtual threads are lightweight; block on IO without pinning platform thread (mostly). Executors.newVirtualThreadPerTaskExecutor() simplifies massive concurrency.

Full explanation

Tie each alert to a user-visible or SLO impact for Virtual Threads (Project Loom). Baseline: Virtual threads are lightweight; block on IO without pinning platform thread (mostly). Executors.newVirtualThreadPerTaskExecutor() simplifies massive concurrency.

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Parent context — Virtual Threads (Project Loom)

Baseline: Virtual threads are lightweight; block on IO without pinning platform thread (mostly). Executors.newVirtualThreadPerTaskExecutor() simplifies massive concurrency.

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