KVM/libvirt/Review libvirt error messages in journald

journalctl -r | grep libvirt | grep error

Errors:

• Cannot allocate memory
• No space left on device
• Failed to get shared "write" lock
• Operation failed: Storage source conflict with pool
• internal error:
  • qemu unexpectedly closed the monitor
  • End of file from qemu monitor
  • connection closed due to keepalive timeout
  • process exited while connecting to monitor
• End of file while reading data: Input/output error
• Failed to acquire pid file
• argument unsupported
• Operation not supported

• unknown procedure
• Unable to read from monitor: Connection reset by peer