VisualBuilder Metric: Zero values ends in a changed behavior of the color rules

[ThiloSchoenfelder]

Kibana version:
7.1.1
Elasticsearch version:
7.1.1
Server OS version:
Windows Server 2012 R2
Browser version:
Chrom Version 74.0.3729.157
IE 11.1805.15063.0

Browser OS version:
Windows 10

Original install method (e.g. download page, yum, from source, etc.):
Download from elastic.co webpage

Describe the bug:
After the upgrade to Eleastic Stack 7.1.1 from 6.7.0

The color rules behavior from the VisualBuild metric changes for Panel filter with a "+"-filter.
Now it change the colores depending on the second value or the total count.

When I use a "-"-filter it still change the color on the first value.
What was the right behavior for both before.

Sorry not the Filter is the issue. It happens wenn the first value is 0.

The color rules behavior from the VisualBuild metric changes for zero values.
When the first value is 0, the colors depending on the second value or the total count.

See definition and behavior in the attached screen shots.

Expected behavior:
always use the first number for the color rules

Screenshots (if relevant):
Zero value; background color should be green:

positiv value; background color is OK:

[elasticmachine]

Pinging @elastic/kibana-app

[alexwizp]

Regression of #27810 #31455