console.log is empty

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Hi Team, I'm using you Hyper-V nova driver. My problem is with console.log file which is empty. I try to get boot logs in dashboard from Linux VM and I have already edited grub2 with "GRUBCMDLINELINUX="console=tty0 crashkernel=auto rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap console=ttyS0,115200n8" string. How can I configure hyperv or nova-compute to get this logs?