I think it would be good to be able to be able to add group layer from MapServer service in ArcGIS Online / Portal for ArcGIS.
The business need is the following : let's take "water burried network" for example, you have a groupLayer in a more general "Network" MapServer service that contains point, line, surface and you want to be able to add that on a map as a whole. I do not want to add every single item as a featureService (nor use a group of featureService as mentionned on the following idea which is in production plan) because the symbology is complex (complex dynamic labelling, arrow on lines to display flow direction, ...) and contains lots of items so it would be slow (though I know WebGL could help someday).
The only workaround so far is to publish it as an individual service but it would increase load on the server to publish every single group as a service as there are many other cases like the one I mentionned above.
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