why my disk got full?

[deadflowr]

ok
that's it? i don't need to make anything else? just these 3 commands? how can i check that it is ok now?

Sure, if you ran the commands or installed dconf-editor and followed the advice in the links.
That should be all that you needed to do.

Note that all it is is a possible solution.
No guarantee that it will work.
All we know is that it's helped other with the same issue.

You can just recheck your logs again.
And see if it still spams those repeating entries.

Edit:
Run the tail command again, since all the new entries will be at the end of the log anyway.

tail /var/log/syslog

I doubt you'll need to see more than the last 10 lines, which the tail command outputs without needing to add the --lines option.