[APM] Respect number format defined in Kibana Advanced Settings

[dgieselaar]

Currently, the APM UI does not respect the Kibana formatting settings wrt number separator, as we explicitly override the format value when using numeral. This means that users cannot display numbers & percents in the APM UI for their preferred locale. See https://discuss.elastic.co/t/customize-number-separator-in-apm/226573

Current UI in Advanced Settings

Suggested solution
Replacing the current UI in Kibana Advanced Settings with dedicated grouping/decimal fields would be a great simplification for the user.

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[sorenlouv]

I think this is similar to #49851 where we can't easily support it because Kibana doesn't have locale settings.

Kibana has these settings for number formatting:

We can't use the "Number format" option because that also sets the precision (we have different precision depending on the context).

I was thinking that perhaps we can use "Formatting locale" since that also contains:

    delimiters: {
        thousands: ' ',
        decimal: ','
    },

But not sure how that doesn't conflict with the "Number format" option - at least from a UX perspective...

I wish that Kibana didn't expose numeral formats directly, but instead exposed specific settings like on Mac OS:

Or Airbnb's even simpler approach:

There's some work happening in #53972 where we may want to chime in.

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sorenlouv]

Closing due to inactivity