How to configure Link down alert in NGAF ?

I want to configure the link down alert in my NGAF, Means whenever link shows Ping error state the Firewall notify me via EMAIL

lets me try

It is not practical to monitor and keep track of the multiple firewalls if they are forwarding logs to the logging service based on their visibility or lack of it on Logs and then verify the forwarding status using show logging-status command on the firewalls.

Use other monitoring tool like SIEMs etc.

In the management portal in the dashboard you can see the actual reading but for the specific alarm and notification to email for the ping error is not doable

You can check the traffic manually but no related alert e-mail will send out.
The alarm is for the Basic, Health Check, Local Logs, System Status and Security Events.
For example, if the intranet is infected with viruses or the disk usage reaches a threshold, the NGAF automatically sends alarm emails to the administrator's mailbox for alarming.

In the management portal in the dashboard you can see the actual reading but for the specific alarm and notification to email for the ping error is not doable

It is not practical to monitor and keep track of the multiple firewalls if they are forwarding logs to the logging service based on their visibility or lack of it on Logs and then verify the forwarding status using show logging-status command on the firewalls.

You can check it in the logs manually but in email it think it is not possible

You may use SIEM or do manually checking the dashboard