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Lacked "memLimitMB" field when using db.hostInfo()

Hi everyone, I am beginner to mongodb.
I use mongodb ver 4.0.6 on ubuntu 16.04. I read this article: https://docs.mongodb.com/manual/reference/command/hostInfo/#hostInfo.system.memLimitMB and repeated it. But I did not see any field name “memLimitMB” in output.
Below is my result’s screenshot, pls help me. I can not explain it.
image

Hi @Vu_Van_Th_ng,

memLimitMB is starting from 4.0.9 and as you’re using 4.0.6 it’s not visible. memLimitMB

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Thank you so much for your helping!