[Lens] Change default formatter for percentages to 0.[00]

[kmartastic]

Default number formatting for percentages should not include 3 digits.
Suggestion: 1 digit after the decimal.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[flash1293]

This makes sense to me, 3 digits seem too much for common use cases. @AlonaNadler what do you think?

[wylieconlon]

To document the current state of things, we need to talk about three settings:

• Pie charts in Lens default to percent mode with 3 decimals
• Lens has a percent formatter which can be used for metrics, and has a default of 2 decimals
• Kibana has a percent formatter which is applied to fields, and has a default of 3 decimals that skip trailing zeroes

Based on the screenshot, I know this is talking about pie charts. But the title is pretty broad. Should we also change the default for the other Lens percent formatter?

[kmartastic]

Yes, I would vote for consistent number formatting across Lens/Kibana.

[wylieconlon]

Based on @AlonaNadler's comment here, we now have a clear choice being made: #70703 (comment)

This makes two changes:

• Default number of decimals moves from 3 -> 2
• Stop using a fixed number of decimal places, instead use maximum of N decimal places. The table below explains this difference:

Input value	User choices	Current output	Output with new decision
6	Default	6.000%	6%
6.1	3 decimals	6.10%	6.1%
5.9090	Default	5.919%	5.91%
5.9090	1 decimal	5.9%	5.9%
5.9090	3 decimals	5.919%	5.919%

In numeral terms, this pattern switches from 0.000% to 0.[00]% as default.

[AlonaNadler]

The table is very helpful, thanks @wylieconlon looks good