What do these lines of the VDS server mean?

Question

Network administration

Hello.
The site has stopped working.
Rebooted VDS
And then this came out.
What to do?

Answer 1

This means the file system is broken,
you need to load in redux mode and try to go through fscheck
if it doesn’t help, then restore from backup

Answer 2

Boot into single mode and run fsck /dev/xvda1
But it's better not to touch anything, feed the dog and ask the hosting support to restore the virtual machine.