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.
Examining last 1 minute
successful web server responses: