Justin, this is internal functionality that is not presently in use.
It is used to detect sudden changes in system values, and has no causal 
consequences.
It may be used to define classes, but it is not documented yet in cfengine 3.

Justin Lloyd wrote:
> I’m trying to understand this message because I’ve got users asking
> about it, thinking it may be causally related to some unexpected
> in-house application restarts. I found Mark’s response to an earlier
> question about this:
> 
>  
> 
> https://cfengine.org/pipermail/help-cfengine/2007-July/001905.html
> 
>  
> 
> However, that goes back to Cfengine 2 and the message still exists in
> Cfengine 3. The source code (env_monitor.c) only indicates this is
> something about “leap detection”, and from the code it would seem that
> leap detection has something to do with detecting unusually large
> changes in system observables. It does tend to show up right after
> Cfengine restarts, which makes me think that it could be seeing large
> changes since lots of observables would go from zero to whatever right
> away as soon as cf-monitord starts gathering data.
> 
>  
> 
> Can anyone who understands this better provide a short explanation of
> this message?  I see it on a lot of systems that don’t have problems,
> which is the other main reason I don’t think it’s related to the
> application restarts, but I’d like to be able to explain what it is to
> our users that are concerned about it.
> 
>  
> 
> Thanks,
> 
> Justin
> 
>  
> 
>  
> 
> *Justin C. Lloyd*
> 
> Senior Unix Infrastructure Engineer
> 
> *Office*: 303.684.4166
> 
> 
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-- 
Mark Burgess

-------------------------------------------------
Professor of Network and System Administration
Oslo University College, Norway

Personal Web: http://www.iu.hio.no/~mark
Office Telf : +47 22453272
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