I think that is a great idea.
I have done something similar to this by separating the range into several series, where each entry only shows up in one series, then using stackmode "stacked". This can be done in either simple or advanced xml. Take a look at the table I would try to create:
domain | red | yellow | green
example.com | 0 | 1 | 0
mydomain.com | 0 | 0 | 1
anotherdomain.com | 1 | 0 | 0
Step 1 - search:
index=_internal | stats count by sourcetype | rangemap field=count green=0-100 yellow=101-1000 default=red | eval red=if(range=="red", 1, 0) | eval yellow=if(range=="yellow", 1, 0) | eval green=if(range=="green", 1, 0) | table sourcetype red yellow green
Step 2 - graph - add this to a panel in a dashboard and edit visualization to be column in stacked mode
Step 3 - change the series color to match - check the docs here
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