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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 11:19:16 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-07-24 09:53:24 +0000 |
commit | b5f8ee61a7f7e9bd291dd26b0585d03eb686c941 (patch) | |
tree | d4d31289c39fc00da064a825df13a0b98ce95b10 /web/api/queries/stddev | |
parent | Adding upstream version 1.44.3. (diff) | |
download | netdata-upstream.tar.xz netdata-upstream.zip |
Adding upstream version 1.46.3.upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/web/api/queries/stddev/stddev.c (renamed from web/api/queries/stddev/stddev.c) | 0 | ||||
-rw-r--r-- | src/web/api/queries/stddev/stddev.h (renamed from web/api/queries/stddev/stddev.h) | 0 | ||||
-rw-r--r-- | web/api/queries/stddev/Makefile.am | 8 | ||||
-rw-r--r-- | web/api/queries/stddev/README.md | 97 |
4 files changed, 0 insertions, 105 deletions
diff --git a/web/api/queries/stddev/stddev.c b/src/web/api/queries/stddev/stddev.c index 8f5431194..8f5431194 100644 --- a/web/api/queries/stddev/stddev.c +++ b/src/web/api/queries/stddev/stddev.c diff --git a/web/api/queries/stddev/stddev.h b/src/web/api/queries/stddev/stddev.h index f7a1a06c3..f7a1a06c3 100644 --- a/web/api/queries/stddev/stddev.h +++ b/src/web/api/queries/stddev/stddev.h diff --git a/web/api/queries/stddev/Makefile.am b/web/api/queries/stddev/Makefile.am deleted file mode 100644 index 161784b8f..000000000 --- a/web/api/queries/stddev/Makefile.am +++ /dev/null @@ -1,8 +0,0 @@ -# SPDX-License-Identifier: GPL-3.0-or-later - -AUTOMAKE_OPTIONS = subdir-objects -MAINTAINERCLEANFILES = $(srcdir)/Makefile.in - -dist_noinst_DATA = \ - README.md \ - $(NULL) diff --git a/web/api/queries/stddev/README.md b/web/api/queries/stddev/README.md deleted file mode 100644 index 3f751a6e1..000000000 --- a/web/api/queries/stddev/README.md +++ /dev/null @@ -1,97 +0,0 @@ -<!-- -title: "standard deviation (`stddev`)" -sidebar_label: "standard deviation (`stddev`)" -custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/stddev/README.md -learn_status: "Published" -learn_topic_type: "References" -learn_rel_path: "Developers/Web/Api/Queries" ---> - -# standard deviation (`stddev`) - -The standard deviation is a measure that is used to quantify the amount of variation or dispersion -of a set of data values. - -A low standard deviation indicates that the data points tend to be close to the mean (also called the -expected value) of the set, while a high standard deviation indicates that the data points are spread -out over a wider range of values. - -## how to use - -Use it in alerts like this: - -``` - alarm: my_alert - on: my_chart -lookup: stddev -1m unaligned of my_dimension - warn: $this > 1000 -``` - -`stdev` does not change the units. For example, if the chart units is `requests/sec`, the standard -deviation will be again expressed in the same units. - -It can also be used in APIs and badges as `&group=stddev` in the URL. - -## Examples - -Examining last 1 minute `successful` web server responses: - -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=min&after=-60&label=min) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=average&after=-60&label=average&value_color=yellow) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=stddev&after=-60&label=standard+deviation&value_color=orange) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=max&after=-60&label=max) - -## References - -Check <https://en.wikipedia.org/wiki/Standard_deviation>. - ---- - -# Coefficient of variation (`cv`) - -> This query is also available as `rsd`. - -The coefficient of variation (`cv`), also known as relative standard deviation (`rsd`), -is a standardized measure of dispersion of a probability distribution or frequency distribution. - -It is defined as the ratio of the **standard deviation** to the **mean**. - -In simple terms, it gives the percentage of change. So, if the average value of a metric is 1000 -and its standard deviation is 100 (meaning that it variates from 900 to 1100), then `cv` is 10%. - -This is an easy way to check the % variation, without using absolute values. - -For example, you may trigger an alert if your web server requests/sec `cv` is above 20 (`%`) -over the last minute. So if your web server was serving 1000 reqs/sec over the last minute, -it will trigger the alert if had spikes below 800/sec or above 1200/sec. - -## how to use - -Use it in alerts like this: - -``` - alarm: my_alert - on: my_chart -lookup: cv -1m unaligned of my_dimension - units: % - warn: $this > 20 -``` - -The units reported by `cv` is always `%`. - -It can also be used in APIs and badges as `&group=cv` in the URL. - -## Examples - -Examining last 1 minute `successful` web server responses: - -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=min&after=-60&label=min) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=average&after=-60&label=average&value_color=yellow) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=cv&after=-60&label=coefficient+of+variation&value_color=orange&units=pcent) -- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=max&after=-60&label=max) - -## References - -Check <https://en.wikipedia.org/wiki/Coefficient_of_variation>. - - |