monitor-fail doesn't exist, but it was mentionned in the documentation.
Fixing it with "monitor fail" instead.
A first set of sample fetch methods applies to internal information which does
not even relate to any client information. These ones are sometimes used with
-"monitor-fail" directives to report an internal status to external watchers.
+"monitor fail" directives to report an internal status to external watchers.
The sample fetch methods described in this section are usable anywhere.
Summary of sample fetch methods in this section and their respective types: