The initial delay is the number of seconds that a new VM takes to
initialize and run its startup script. During a VM's initial delay
period, the MIG ignores unsuccessful health checks because the VM might
be in the startup process. This prevents the MIG from prematurely
recreating a VM. If the health check receives a healthy response during
the initial delay, it indicates that the startup process is complete and
the VM is ready. The value of initial delay must be between 0 and 3600
seconds. The default value is 0.
