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netdata_netdata/web/api/queries/median
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Costa Tsaousis 44955f720e
fix incorrect use of isnormal() ()
2019-03-21 19:14:14 +02:00
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Makefile.am modularize the query api () 2018-10-23 00:38:04 +03:00
median.c fix incorrect use of isnormal() () 2019-03-21 19:14:14 +02:00
median.h query code cleanup () 2018-10-24 23:06:46 +03:00
README.md Ga () 2018-12-07 11:30:04 +01:00

README.md

Median

The median is the value separating the higher half from the lower half of a data sample (a population or a probability distribution). For a data set, it may be thought of as the "middle" value.

median is not an accurate average. However, it eliminates all spikes, by sorting all the values in a period, and selecting the value in the middle of the sorted array.

how to use

Use it in alarms like this:

 alarm: my_alarm
    on: my_chart
lookup: median -1m unaligned of my_dimension
  warn: $this > 1000

median does not change the units. For example, if the chart units is requests/sec, the result will be again expressed in the same units.

It can also be used in APIs and badges as &group=median in the URL.

Examples

Examining last 1 minute successful web server responses:

References

analytics