Opened 2 years ago

Closed 21 months ago

Last modified 19 months ago

#1051 closed defect (wontfix)

Graphs monthly aren't correct Munin

Reported by: admins Owned by: nobody
Priority: high Milestone: Munin 1.4.7
Component: plugins Version: 1.4.5
Severity: normal Keywords:
Cc:

Description

If you look at the week graph:
You see blocked by manitu: 1056.05
But the graph shows something between 800 and 900

How could I correct this?

Thanks

Attachments (2)

stefan_test-week.png (18.2 KB) - added by admins 2 years ago.
Graph Week
bache.ping.uio.no-entropy-month.png (24.4 KB) - added by snide 21 months ago.
Month Min/Max? on entropy

Download all attachments as: .zip

Change History (4)

Changed 2 years ago by admins

Graph Week

comment:1 Changed 2 years ago by bldewolf

This is an artifact of the storage format: The RRD file stores min/max/average values for the time periods specified by Munin, but when Munin generates graphs the line is always based on the average values. Since the larger time span views have to compress the data, the larger time spans cause the sharp peaks and valleys in the average values to soften and disappear. Conversely, it's easy to retain the max/min information because you just keep the bigger/smaller value. In this way, the further you zoom out, the more flat the line will get, while the min/max will still tell you how high it actually went.

I've seen other projects that use RRDs show the MAX/MIN values on the graphs, but I'm not sure if Munin has any built-in capability for it. It's tricky because it can easily make the graph crowded and hard to interpret.

Changed 21 months ago by snide

Month Min/Max? on entropy

comment:2 Changed 21 months ago by snide

  • Resolution set to wontfix
  • Status changed from new to closed

Actually, when having only a single value, the MIN/MAX values are showed as an AREA around the AVERAGE.

Like in the entropy montly graph attached.

So, marking this as "wontfix" since it is the normal way to deal with it.

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