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Node — Flush and shutdown

Flush queued events immediately with flush(), or stop the flush timer and flush with shutdown() before process exit. Both are async (return a Promise).

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flush()

Flush all queued events to the server immediately. 
await signal.flush();
Use when you need to ensure events are sent before a response or before the process exits (e.g. in a serverless function or after a critical path).

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shutdown()

Stop the flush timer and flush remaining events. Call before process exit for graceful shutdown. 
await signal.shutdown();
Use in cleanup handlers (e.g. process.on('SIGTERM', ...)) so no events are lost when the process exits.

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See also