Expose other extended_stats metrics

[lukasolson]

Prior to #2983, I believe, instead of a "Standard Deviation" metric, there was an "Extended Stats" metric which allowed you to see all of the metrics that came back from the extended_stats call (avg, count, max, min, std_deviation, std_deviation_bounds, sum, sum_of_squares, variance).

It was replaced with a single metric for "Standard Deviation" (which only includes the bounds, not the actual std_deviation or variance).

It would be nice if there were still some way to select std_deviation, sum_of_squares, and variance as the metric.

[blfrantz]

I for one definitely want this. I'm in the process of trying to convince some stakeholders to invest in standing up an ELK solution. A client recently asked to be able to sort a dataset by standard deviation, and I was able to create a Data Table with this information in a few minutes in our prototype server, only to find out that the "standard deviation" metric isn't actually the standard deviation, but "bounds" which isn't the same thing and didn't meet his requirement.

After digging into it I realized that standard deviation (along with variance) is actually already calculated (it's even returned in the API response from Elastic), it's just not exposed as a "Metric" option in the Kibana UI, making it essentially unusable. Hoping it gets added back soon.

[MerlijnWajer]

Would love to see this functionality restored too.

[lomacks]

+1

[drivo]

+1

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)