When you are using Nagios as montitoring core then backslashes contained
in custom_checks (Classical active and passive Nagios checks) would
be interpreted by Nagios. That way single backslashes would usually vanish
und you would have to duplicate them.
The Check_MK Micro Core never interpreted these backslashes so it was
transparent for the user.
This fix changes the behaviour of Check_MK in a way that also with the
Nagios core you need only one backslash. Backslashes are transparent
NOTE: If you have custom checks that contain backslashes (for
example as part of names or passwords) then you need to remove
duplicate backslashes after this update!
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