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1 # Percentile
2
3 The percentile is the average value of a series using only the smaller N percentile of the values.
4 (a population or a probability distribution).
5
6 Netdata applies linear interpolation on the last point, if the percentile requested does not give a round number of
7 points.
8
9 The following percentile aliases are defined:
10
11 - `percentile25`
12 - `percentile50`
13 - `percentile75`
14 - `percentile80`
15 - `percentile90`
16 - `percentile95`
17 - `percentile97`
18 - `percentile98`
19 - `percentile99`
20
21 The default `percentile` is an alias for `percentile95`.
22 Any percentile may be requested using the `group_options` query parameter.
23
24 ## how to use
25
26 Use it in alerts like this:
27
28 ```
29 alarm: my_alert
30 on: my_chart
31 lookup: percentile95 -1m unaligned of my_dimension
32 warn: $this > 1000
33 ```
34
35 `percentile` does not change the units. For example, if the chart units is `requests/sec`, the result
36 will be again expressed in the same units.
37
38 It can also be used in APIs and badges as `&group=percentile` in the URL and the additional parameter `group_options`
39 may be used to request any percentile (e.g. `&group=percentile&group_options=96`).
40
41 ## Examples
42
43 Examining last 1 minute `successful` web server responses:
44
45 - ![](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)
46 - ![](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)
47 - ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=percentile95&after=-60&label=percentile95&value_color=orange)
48 - ![](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)
49
50 ## References
51
52 - <https://en.wikipedia.org/wiki/Percentile>.