First of all I want to thank you for creating such dashboard and config files.
MAT,agent_host=192.168.2.1,host=mat-tr-mntr cpu_usage=0i,ha_auto_sync=2i,ha_mode=1i,hostname="MAT-TR-FW001.mat.local",memory_usage=50i,os_version="v7.2.4,build1396,230131 (GA.F)",uptime=398681665i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=42,ifName=WIFI_MAT_USER ifHighSpeed=0i,ifInErrors=0i,ifInOctets=1814708099i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=3032211339i,ifType=209i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=33,ifName=port15 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=41,ifName=WIFI_GUEST ifHighSpeed=0i,ifInErrors=0i,ifInOctets=3398990169i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=2295644615i,ifType=209i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=30,ifName=port12 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=10,ifName=port24 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=36,ifName=l2t.root ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=152i,ifType=131i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=21,ifName=port3 ifHighSpeed=1000i,ifInErrors=0i,ifInOctets=2571903708i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=3050399525i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=7,ifName=port21 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=9,ifName=port23 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=3,ifName=port17 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=6,ifName=port20 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=38,ifName=MAT_IZM_LOCAL ifHighSpeed=10000i,ifInErrors=0i,ifInOctets=1103818849i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=2262856529i,ifType=135i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=19,ifName=port1 ifHighSpeed=1000i,ifInErrors=0i,ifInOctets=1213700792i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=592914413i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=29,ifName=port11 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=37,ifName=SERVER-1 ifHighSpeed=10000i,ifInErrors=0i,ifInOctets=3081660409i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=694524308i,ifType=135i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=16,ifName=ssl.root ifAlias="SSL VPN interface",ifHighSpeed=0i,ifInErrors=0i,ifInOctets=734874827i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=1742531827i,ifType=131i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=32,ifName=port14 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=5,ifName=port19 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=31,ifName=port13 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=4,ifName=port18 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=28,ifName=port10 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=39,ifName=WATCHGUARD_INT ifHighSpeed=0i,ifInErrors=0i,ifInOctets=3147374000i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=4009845832i,ifType=209i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=1,ifName=mgmt ifHighSpeed=1000i,ifInErrors=0i,ifInOctets=125230892i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=60i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=35,ifName=naf.root ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=152i,ifType=131i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=13,ifName=x3 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=34,ifName=port16 ifHighSpeed=1000i,ifInErrors=0i,ifInOctets=3147374000i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=4009846012i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=27,ifName=port9 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=20,ifName=port2 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=15,ifName=modem ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=22,ifName=port4 ifHighSpeed=1000i,ifInErrors=0i,ifInOctets=3565906062i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=2295644705i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=2,ifName=ha ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=12,ifName=x2 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=26,ifName=port8 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=8,ifName=port22 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=23,ifName=port5 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=40,ifName=INTERNET ifHighSpeed=0i,ifInErrors=0i,ifInOctets=906133317i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=592914323i,ifType=209i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=14,ifName=x4 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=11,ifName=x1 ifHighSpeed=10000i,ifInErrors=0i,ifInOctets=1651790934i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=464164538i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=17,ifName=lan ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=209i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=24,ifName=port6 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=18,ifName=fortilink ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=161i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=25,ifName=port7 ifHighSpeed=0i,ifInErrors=0i,ifInOctets=0i,ifOperStatus=2i,ifOutErrors=0i,ifOutOctets=0i,ifType=6i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=43,ifName=MATEXEC ifHighSpeed=10000i,ifInErrors=0i,ifInOctets=1504364849i,ifOperStatus=1i,ifOutErrors=0i,ifOutOctets=1801750907i,ifType=135i 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=39 ip="192.168.10.1",net_mask="255.255.255.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=42 ip="10.135.0.1",net_mask="255.255.254.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=41 ip="192.168.6.1",net_mask="255.255.254.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=40 ip="92.45.63.174",net_mask="255.255.255.252" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=37 ip="192.168.2.1",net_mask="255.255.254.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=18 ip="169.254.1.1",net_mask="255.255.255.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=17 ip="10.0.0.1",net_mask="255.255.248.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=38 ip="10.35.0.1",net_mask="255.255.248.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=1 ip="192.168.5.49",net_mask="255.255.254.0" 1685949049000000000
MAT,agent_host=192.168.2.1,host=mat-tr-mntr,ifIndex=43 ip="10.235.0.1",net_mask="255.255.0.0" 1685949049000000000
MAT,agent_host=192.168.2.1,ha_stats_index=1,host=mat-tr-mntr ha_stats_cpu_usage=0i,ha_stats_memory_usage=0i,ha_stats_net_usage=0i,ha_stats_ses_count=0i,ha_stats_sync_status=0i 1685949049000000000
Looks like there are no errors while testing but I got "No data" on the dashboard I've just imported from your repo. What might I am missing?