json.c: be consistent with fields on the man manual

[ShirleyFei]

Update the json key strings to be consistent with fields on the man manual as users would resort to man manual when they want to figure out what does the indicator mean. Besides, the shortened json key strings alleviate network transmission pressure.

[Atoptool]

By making these changes, current usage of the JSON key strings will become highly incompatible. In my opinion, most key strings that are currently used are rather self-explaining and can be easily linked to the key strings that are described in the man page.

[ShirleyFei]

By making these changes, current usage of the JSON key strings will become highly incompatible. In my opinion, most key strings that are currently used are rather self-explaining and can be easily linked to the key strings that are described in the man page.

Got it, incompatible is quite dangerous. The reason to shorten json key strings is trying to alleviate network transmission and storage pressure now we faced. But anyway, I will close this, thanks for the reminder. :)