I had to disable swap check for one of my hosts.
This is how I’v done it.

nano /etc/icinga2/conf.d/services.conf

apply Service "swap" {
  import "generic-service"

  check_command = "swap"

  assign where host.name == NodeName
  ignore where host.name == "my_host"
}

service icinga2 restart

on icinga2 service.conf I’v added the following line ignore where host.name == “my_host” and then restarted icinga2

icinga2 feature enable command
service icinga2 restart

This is how I’v solved it

chmod +s /bin/ping

as seen on https://github.com/bodsch/docker-icinga2/issues/46