[collectd] Wrong metric values
chris at ettaviation.com
Thu Jul 21 21:51:16 CEST 2016
Good thought... turns out the plugin works differently though, according to the Following Files section here: https://collectd.org/wiki/index.php/Plugin:Tail
At each interval it will read all lines up to the end of the already-opened file.
Still stuck on this... I really don't understand why it is sending me fractions instead of whole numbers.
From: Jacob Bisby [mailto:Jacob.Bisby at uniscope.com.au]
Sent: Wednesday, July 20, 2016 8:55 PM
To: Chris Lajoie <chris at ettaviation.com>; collectd at verplant.org
Subject: RE: Wrong metric values
I've not used the tail plugin before, but assuming it's similar to the bash command - with that long a polling interval, is it definitely tailing enough lines in the log to pick up all the expected data at each interval?
- Jacob Bisby
From: collectd [mailto:collectd-bounces at verplant.org] On Behalf Of Chris Lajoie
Sent: Thursday, 21 July 2016 10:46 AM
To: collectd at verplant.org
Subject: [collectd] Wrong metric values
Hi, I have been using collectd successfully for some time with the standard plugins like cpu, memory, etc.
I just started trying to use the tail plugin to gather stats from postfix log output. The problem I am seeing is that the metrics outputted (to graphite in my case) are too small - nowhere even close to what they should be. Here is part of my config for the tail plugin
This should increment the counter each time it sees "RelayedOutbound" in the log file.
If I count the occurrences of RelayedOutbound in a 1-minute segment of the log file I get something like this:
[chris at ett1 ~]# cat /var/log/maillog | grep 2016-07-20T20:14 | grep RelayedOutbound | wc -l
The interval in collectd is set to 30 seconds, so during this 1 minute period, I think I should have got 2 values from collectd that are around 20-25ish. Instead, the 2 values I got from collectd are:
2016-07-20 20:14:10 1.200543
2016-07-20 20:14:40 0.866675
These numbers shouldn't even be fractions.. I would have thought I'd get whole numbers only.
Is this a bug?
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