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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-07-24 09:54:23 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-07-24 09:54:44 +0000
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parentReleasing debian version 1.44.3-2. (diff)
downloadnetdata-836b47cb7e99a977c5a23b059ca1d0b5065d310e.tar.xz
netdata-836b47cb7e99a977c5a23b059ca1d0b5065d310e.zip
Merging upstream version 1.46.3.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-<!--
-title: "Single (or Simple) Exponential Smoothing (`ses`)"
-sidebar_label: "Single (or Simple) Exponential Smoothing (`ses`)"
-custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/ses/README.md
-learn_status: "Published"
-learn_topic_type: "References"
-learn_rel_path: "Developers/Web/Api/Queries"
--->
-
-# Single (or Simple) Exponential Smoothing (`ses`)
-
-> This query is also available as `ema` and `ewma`.
-
-An exponential moving average (`ema`), also known as an exponentially weighted moving average (`ewma`)
-is a first-order infinite impulse response filter that applies weighting factors which decrease
-exponentially. The weighting for each older datum decreases exponentially, never reaching zero.
-
-In simple terms, this is like an average value, but more recent values are given more weight.
-
-Netdata automatically adjusts the weight (`alpha`) based on the number of values processed,
-using the formula:
-
-```
-window = max(number of values, 15)
-alpha = 2 / (window + 1)
-```
-
-You can change the fixed value `15` by setting in `netdata.conf`:
-
-```
-[web]
- ses max window = 15
-```
-
-## how to use
-
-Use it in alerts like this:
-
-```
- alarm: my_alert
- on: my_chart
-lookup: ses -1m unaligned of my_dimension
- warn: $this > 1000
-```
-
-`ses` does not change the units. For example, if the chart units is `requests/sec`, the exponential
-moving average will be again expressed in the same units.
-
-It can also be used in APIs and badges as `&group=ses` 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&options=unaligned&dimensions=success&group=min&after=-60&label=min)
-- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&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&options=unaligned&dimensions=success&group=ses&after=-60&label=single+exponential+smoothing&value_color=orange)
-- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
-
-## References
-
-- <https://en.wikipedia.org/wiki/Moving_average#exponential-moving-average>
-- <https://en.wikipedia.org/wiki/Exponential_smoothing>.
-
-