Add a HostUnreachable alert (for icmp failures)

1 job from master in 18 minutes and 2 seconds (queued for 15 seconds)
Status Job ID Name Coverage
  Test
failed #6242
ai3
run_full_test

00:18:02

 
Name Stage Failure
failed
run_full_test Test
Running playbook ../../playbooks/integration-test.yml...
ERROR: failed to run the integration tests
~/builds/20519861/0/ai3/float/test/test-full ~/builds/20519861/0/ai3/float/test/test-full ~/builds/20519861/0/ai3/float/test
==> host2: Forcing shutdown of VM...
==> host2: Destroying VM and associated drives...
==> host1: Forcing shutdown of VM...
==> host1: Destroying VM and associated drives...
~/builds/20519861/0/ai3/float/test/test-full ~/builds/20519861/0/ai3/float/test
ERROR: Job failed: exit status 1