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Please note that changes to any of these globals also don't become effective until the next type=update operation is performed.
Interfaces which have been down for a long time
NMIS includes a feature which will disable collecting of interfaces which are down for a period of time, by default, this is 30 days, this is because if down for 1 month, it is likely the interface is not being used anymore. This feature can be disabled by setting the value in the Config.nmis for global_nocollect_interface_down_days to a very high number, like 5000 or more. Or the interface can be set in Node Config to always collect.