Uniquely identify a server instance with an ID
When bun is started with the --hot flag:
This string will be used to hot reload the server without interrupting pending requests or websockets. If not provided, a value will be generated. To disable hot reloading, set this value to null.
When bun is not started with the --hot flag:
This string will currently do nothing. But in the future it could be useful for logs or metrics.