The "/errorlog" page:

Show the content of the error log. Only the administrator can view this page.

y=0x001

Show only hack attempts

y=0x002

Show only panics and assertion faults

y=0x004

Show hung backoffice processes

y=0x008

Show POST requests from a different origin

y=0x010

Show SQLITE_AUTH and similar

y=0x020

Show SMTP error reports

y=0x040

Show TH1 vulnerability reports

y=0x800

Show other uncategorized messages

If y is omitted or is zero, a count of the various message types is shown.