openstack-nova-compute.service is crashed and not coming up even after restarting..

Nova Compute Log:
2020-01-16 03:04:04.490 202042 INFO nova.virt.libvirt.driver [req-834578e2-974b-4f47-a785-5240f6a2d31f - - - - -] Connection event '0' reason 'Connection to libvirt lost: 1'

Service log :
● openstack-nova-compute.service
   Loaded: not-found (Reason: No such file or directory)
   Active: failed (Result: signal) since Thu 2020-01-16 03:12:58 IST; 4 days ago
 Main PID: 202042 (code=killed, signal=ALRM)

Jan 16 03:11:58 localhost.localdomain systemd[1]: Stopping OpenStack Nova Compute Server...
Jan 16 03:12:58 localhost.localdomain systemd[1]: openstack-nova-compute.service: main process exited, code=killed, status=14/ALRM
Jan 16 03:12:58 localhost.localdomain systemd[1]: Stopped OpenStack Nova Compute Server.
Jan 16 03:12:58 localhost.localdomain systemd[1]: Unit openstack-nova-compute.service entered failed state.
Jan 16 03:12:58 localhost.localdomain systemd[1]: openstack-nova-compute.service failed.
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.