getSystemDisk showing incorrect root usage and reporting incorrect alarm

Customer asked about a Minor Alarm reported on disk usage, when disk usage was at 4%.
Install is on a root install.

Issue was that ServerMonitor is getting the /root disk usage incorrectly.

Alarm:

AlarmID = 6
Brief Description = DISK_USAGE_LOW
Alarm Severity = MINOR
Time Issued = Tue Apr 2 14:37:37 2019
Reporting Module = pm1
Reporting Process = ServerMonitor
Reported Device = /

unix disk usage

root@ip-10-59-10-117 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/nvme0n1p1 100G 3.8G 97G 4% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 26M 16G 1% /dev/shm
tmpfs 16G 33M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/mapper/23437383037613530 1.6T 1.2T 299G 81% /usr/local/mariadb
tmpfs 3.1G 0 3.1G 0% /run/user/0

ServerMonitor calulation

mcsadmin> getsystemdisk
getsystemdisk Tue Apr 2 19:29:58 2019

System Disk Usage per Module
Module 'pm1' Disk Usage (in 1K blocks)

Mount Point Total Blocks Used Blocks Usage %
----------------------------- ------------ ------------ -------
/ 1651258452 1254582844 76