enhancement - add percentile line/values to histogram

[Chadwiki]

1. Add percentile line values to the histogram.
2. Plot other query values , thus show what falls below or above the % line

Example:

# Curl --
{
    "aggs": {
        "load_time_outlier": {
            "percentiles": {
                "field": "duration",
                "percents": [ 50, 75, 95, 99.9 ]
            }
        }
    }
}

# output --
values: {
    "50.0": 22.376878868258178
    "75.0": 721.1441558441559
    "95.0": 14238.692032967027
    "99.9": 526479.7200000014
}

[w33ble]

Seems related to #885 - Mainly, the ability to customize the Y-Axis labels and lines. I thought I saw another issue related to it as well, but can't seem to find it now.

[arnauldvm]

I'm not quite sure it's related to #885.
AFAIU #885 is just about changing the format of values displayed on the Y-axis.

The percentile is just another kind of metric. E.g. instead of calculating an average value for records in a time interval, you calculate the value which is such that 95% of the records are below that value - the value is called the 95-percentile.
Or, instead of calculating the "count" of records, one could calculate the percentage of records where the value is below a fixed reference, which is easier but gives a different curve. (See also Wikipedia)

Those two metrics are quite often used to define SLA, and as such would be very useful.

See also this intersting article: http://www.elasticsearch.org/blog/averages-can-dangerous-use-percentile/

[Chadwiki]

Not related to #885 - this would require an aggregation of the value field and thus represent the statistical percentiles around a given value.
@arnauldvm has stated it very well...

would a sample graph help?

[w33ble]

Sorry, was pruning a lot of issues at the time and didn't understand this correctly. You're right, the two are not related.

Currently percentile aggregations are missing completely from Kibana due to #1536, which is on the roadmap. That'd be the ticket to watch for this.

[Chadwiki]

I would like to clarify, histogram reference was b/c of Kibana 3 panel type.
The visual should be a Line Chart/Graph , ref Kibana 4

[w33ble]

I believe this was actually closed by #2486

This has been available for a bit now, and will be in an official release when we release the first RC (very soon)

[Chadwiki]

This current in Kibana 4

[rashidkpc]

@webtoed thanks for the followup!