Clear. But the LMS is pinging all the ASA interfaces although it's managed by its inside interface only. Is it a normal case?

When you add a device it adds all the interfaces of the devices. what you should do is go to device manager and select the device and under the interfaces make the desired interfaces status to False from drop down menu. This interfaces will not monitored any more.

HTH

Hitesh Vinzoda

Please rate helpful posts.

While you can do this, you may not want to disable the entire interface.  Instead, if you only want to disable the ICMP polling of the interface IP, go to DFM > Device Management > Device Details, and select the IP option from the tree (when you have launched the Detailed Device View for your ASA).  In the right-hand frame you should see a list of IPs on the ASA.  Make sure all of them have a management state of false except the IP by which the ASA is managed.  That will prevent pings from going out to those other interfaces while making sure DFM can report on other interface-related faults.