[Xymon] Gaps in graphs

[Carl Melgaard]

On Mon, 8 Mar 2021 at 19:21, Carl Melgaard <Carl.Melgaard at stab.rm.dk<mailto:Carl.Melgaard at stab.rm.dk>> wrote:

>One last thing to look at. Are the gaps actual missing data points, or are they values of zero? The way to tell this is to dump the RRD file's contents using something like "rrdtool fetch netstat.rrd AVERAGE | tail -100" (or "less rather than tail -100) and look for either zero or low numbers, >or NaN (not a number) entries. [Note that the last few are usually NaN because they're still waiting for updates, so you can ignore those.]

Currently I cant actually find a graph with a gap in it. I just noticed because it happened on the Xymon server itself. On my old setup, it never happened.

>OK. I think your best bet to diagnose is going to be correlating log messages or other events to the gaps.
>You mentioned an "old setup". Can you describe what has changed from old to new setup? Have you upgraded hardware/OS/Xymon server/Xymon client(s)?

I changed OS, CentOS 5.11 -> RH 7.9 and Xymon from 4.3.7 to 4.3.30, and changed from selfcompiled to Terabithia-packages. So quite a big jump.
Yes, client and server both runs on the same host. As did it on the old system. I want he Xymon server itself monitored. I have 2 Xymon servers, 1 primary and 1 secondary. The primary distributes to the secondary. Only the secondary is updated as of yet.

>You said that you noticed on the Xymon server itself. Has it only happened to graphs for the Xymon server? I'm wondering if you have the Xymon client AND the Xymon server both running on the same host?

After I noticed it on the Xymon server itself, I went looked for gaps elsewhere, and I found some on other servers as well.

Also in xymonclient.log I get these quite alot, dunno if its related:

mv: cannot stat '/dev/shm/logfetch.x.cfg.tmp': No such file or directory
cat: /dev/shm/xymon_vmstat.x: No such file or directory
cat: /dev/shm/xymon_vmstat.x: No such file or directory

>Can you explain "quite alot"? Can you give an indication of how often these occur?

623 lines in the logfile yesterday.

Regards,

Carl
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