What use cases exist for async_hooks?

  • long stack traces
    - can produce more meaningful error information
    - helpful for debugging complex async execution chains
  • lifecycle tracking of libuv requests/handles
    - helps detect resource starvation
    - could probably provide some meta information to differentiate requests/handles
  • detecting blocking code
    - measuring sync execution time of each callback
    - helps to identify code that could be moved to worker threads
  • counting created promises
  • detecting port of new servers without monkey-patching

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