Emitted when the server monitor’s hello command is started - immediately before the hello command is serialized into raw BSON and written to the socket.当服务器监视器的hello命令启动时，即在hello命令序列化为原始BSON并写入套接字之前发出。
The connection id for the command
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Emitted when the server monitor’s hello command is started - immediately before the hello command is serialized into raw BSON and written to the socket.当服务器监视器的hello命令启动时，即在hello命令序列化为原始BSON并写入套接字之前发出。