Do your VMs have very long uptimes? This is an indicator of the stable system fallacy.
If the system was implemented correctly the first time, resource use never exceeds capacity, maintenance always works properly, versions are always up to date, and the infrastructure (power, network, host, storage, cooling) never has problems, then the system appears perfectly stable. But introduce changes and errors with increasing frequency and you quickly find out how robust it actually is.
If the system was implemented correctly the first time, resource use never exceeds capacity, maintenance always works properly, versions are always up to date, and the infrastructure (power, network, host, storage, cooling) never has problems, then the system appears perfectly stable. But introduce changes and errors with increasing frequency and you quickly find out how robust it actually is.