Graphs and custom units (KB/KiB, MB/MiB, ...)

jvns · May 10, 2022, 12:57pm

It would seem that CheckMK only allows for ‘Bytes’ as Unit for it’s Graphs. Is there a way to add ‘KiloBytes/KibiBytes’, ‘MegaBytes/MebiBytes’, etc… (like Grafana)?

Using CheckMK 2.0.0p23 (CFE)

mike1098 · May 10, 2022, 2:01pm

May you provide some more details about what check you complain and where you miss these units?

Checkmk definitely support not only Bytes:

This depends on the graph definition.

Or how the check is written:

BR

MF

jvns · May 10, 2022, 2:09pm

Of course,

It’s regarding a Custom Graph of the Performance Data of an ‘Integrated Nagios Plugin’.

The plugin returns metrics in MiB, not in Bytes.

Since the Unit is in ‘Bytes’, the graph is all wrong reporting a Total of just above 1GB whereas it’s considerably more than that in real life.

As you can see from the second screenshot, only Bytes are available.

mike1098 · May 10, 2022, 2:25pm

If I look in at the metric definition I also cannot see bit, only bit/s. Really wondering why its not there.

github.com

tribe29/checkmk/blob/2.0.0/cmk/gui/plugins/metrics/unit.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright (C) 2019 tribe29 GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

import cmk.utils.render

from cmk.gui.i18n import _

from cmk.gui.plugins.metrics import (
    unit_info,)

from cmk.gui.valuespec import (
    Age,
    Float,
    Percentage,
    Integer,
    Filesize,
)

This file has been truncated. show original

Has anyone else an explanation why bit is nit in the unit definition file?

r.sander · May 10, 2022, 3:34pm

The check plugins need to return metrics in the base unit. Checkmk uses base units and the graphs may scale these to MB, GB or TB.

You may need to change the check plugin to multiply the metric by 1024 * 1024.

jvns · May 11, 2022, 8:03am

Shouldn’t this be handled in the presentation layer?

I’m mildly disappointed of the very few options CheckMK provides here. And because of that, I need to modify pretty much all plugins + Grafana graphs that depend on these metrics?

Just look at the proper amount of options in Grafana:

CheckMK on the other hand only provides 1 option: “Bytes”… that isn’t being serious…

r.sander · May 11, 2022, 10:08am

I do think that storing all metrics in base units makes things way much simpler.

mike1098 · May 11, 2022, 3:53pm

Just to clarify, If I well understood the TO´s plugin sends the data in bit and not in byte.
@jvns Correct?

jvns · May 13, 2022, 6:33am

mike1098, actually the plugin reports back the data in Mebibytes (MiB).

mike1098 · May 30, 2022, 3:33pm

Hello, sorry for late reply.
Basically an official answer from Tribe29 would be needed.
I can only assume that in order to be able to consolidate the rules etc. a decision was made that only byte is supported and all plugins have to convert to bytes.

Sorry but I cannot help further.

jvns · June 8, 2022, 8:12am

Thanks mike1098.

I would surely like an official answer
Maybe the option to have “user-generated custom unit plugins” maybe?

system · June 8, 2023, 8:12am

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