Netdata have several health checks. This can be found in folder
/etc/netdata/health.d/
You can configure alarm notify options in file
/etc/netdata/health_alarm_notify.conf
If you want to disable all alerts from netdata, edit
vi /etc/netdata/netdata.conf
Find
[health] # enabled = yes
Replace with
[health] enabled = no
Restart netdata
service netdata restart