[Visualizations] Metrics chart not converting averages properly

[crespocarlos]

Describe the feature
On the metrics chart type, the average displayed on the bottom right side is not correctly converted to the right unit for large numbers

e.g: 225,092.2T should be 230Pbit instead:

The same is not observed with small numbers

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)

[dej611]

Had a quick investigation on this, as it looks a pretty quick fix, but actually found that the problem here is very specific to the Metric visualization and the Bit (1000) format.
In detail, the Metric visualization leverages the EC39 Intl.NumberFormat for a compact representation of the value.

Looking at the list of valid unit values for the bits realm can go up to the terabit option, which is apparently also the higher unit in the UNICODE supported unit list, so even providing the right unit as petabit in the code leads to this JS error:

Uncaught RangeError: Invalid unit argument for Intl.NumberFormat() 'petabit'

My proposal would be to go here with the Numeraljs when using the Bit formatter, at least till the number of supported units in the EC39 standard would increase to include also higher values.

[drewdaemon]

I don't like the complexity of the hybrid approach but if this is a necessary feature I can't think of a better option. 🤷‍♂️

[stratoula]

I am changing this to enhancement

[markov00]

Looking at the list of valid unit values for the bits realm can go up to the terabit option, which is apparently also the higher unit in the UNICODE supported unit list, so even providing the right unit as petabit in the code leads to this JS

That looks like just an oversight of unicode, the terabyte and terabit exist, then exist petabyte but not petabit...why? :( I don't see a valid reason for that

[drewdaemon]

I agree @markov00 ... very strange.

[dej611]

Actually I would even use numeral.js even for bytes as the unit support is pretty limited not just for the Bit version, but also for the binary version Bytes.

[dej611]

Decided to go and use numeral.js here.