MartinEmrich commented on issue #8177:
URL: https://github.com/apache/cloudstack/issues/8177#issuecomment-1790424694

   After reading the longs for a while longer, I suspect it's related to 
renaming or destroying a VM, not creating it.
   
   At 8:49, a VM has been renamed from "test-ci-12" to "test-ci-12-CDSDEL" (our 
CI/CD tooling adds a suffix to the VM name prior to deletion, to make the name 
available for a replacement even before Delete/Expunge/Destroy is complete)
   At 8:50, the VM has been destroyed (destroyVirtualMachine, expunge=true)
   At 8:57, the health check message says `"Missing entries for VMs in 
/etc/hosts -\n10.12.96.9 test-ci-12"`, so it apparently neither has caught up 
with that rename, nor the destroy.
   
   That process happens many times, only rarely do we get the Health Check 
failed email. But with 4.11 it came a few times per year, since upgrading to 
4.18, it comes multiple times a week.
   
   @weizhouapache The management server log from that rename up to the health 
check is 1.4MB, and cleaning all internal data (VM names, host names, user 
names, domains, IPs) would most probably make it useless. If you have specific 
questions, I can look it up though.


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