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.IX Title "..::lib::Smokeping::matchers::Median 3"
.TH ..::lib::Smokeping::matchers::Median 3 2024-02-04 2.8.2 SmokePing
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.SH NAME
Smokeping::matchers::Median \- Find persistent changes in latency
.SH OVERVIEW
.IX Header "OVERVIEW"
The idea behind this matcher is to find sustained changes in latency.
.PP
The median matcher takes a number of past median latencies. It splits the latencies into
two groups (old and new) and again finds the median for each groups. If the
difference between the two medians is bigger than a certain value, it will
give a match.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Call the matcher with the following sequence:
.PP
.Vb 2
\& type = matcher
\& pattern =  Median(old=>x,new=>y,diff=>z)
.Ve
.PP
This will create a matcher which consumes x+y latency-datapoints, builds the
two medians and the matches if the difference between the median latency is
larger than z seconds.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2004 by OETIKER+PARTNER AG. All rights reserved.
.SH LICENSE
.IX Header "LICENSE"
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
.PP
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
.SH AUTHOR
.IX Header "AUTHOR"
Tobias Oetiker <tobi@oetiker.ch>