Not sending out notifications

Icinga Web
7

Where would the icinga2 log be?(I am using Centos7)

This is in my templates.conf for mail-service-notification

template Notification "mail-service-notification" {
command = "mail-service-notification"

states = [ OK, Warning, Critical, Unknown ]
types = [ Problem, Acknowledgement, Recovery, Custom,
        FlappingStart, FlappingEnd,
        DowntimeStart, DowntimeEnd, DowntimeRemoved ]

vars += {
// notification_icingaweb2url = "https://www.example.com/icingaweb2"
// notification_from = "Icinga 2 Service Monitoring <icinga@example.com>"
notification_logtosyslog = false
}
period = "24x7"
}