You can only address this issue by understanding the application that is running on this host.
Committed memory is memory allocated by processes but currently not used. The Linux kernel overprovisions memory in this case. Hence the warning at 100% used RAM. If suddenly all allocated memory was used by the processes you would get an out of memory error after filling swap space.
If this is quite normal behaviour by the application and it checks RAM limits by itself you could increase the thresholds for this service check.
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