Log spammed with LogSlate:Warning: 'Roboto' does not provide a composite font 0

Our log is being spammed thousands of times with this error:

LogSlate:Warning: ‘Roboto’ does not provide a composite font that can be used with Slate. Slate will be forced to use the fallback font path which may be slower.

I’ve seen many people having these in their logs, what is it? Is it something we need to solve and if yes how?

having the same issue

Same issue here.

Ditto.

This and:

CreateImport: Failed to load Outer for resource 'WidgetTree': WidgetBlueprint /Script/UMGEditor.Default__WidgetBlueprint

This was fixed by https://github.com/EpicGames/UnrealEngine/commit/b98dffc294015e96d121f67b63ca0fcfc402b873

This warning doesn’t harm anything, it was fixed in 4.11 for UE4Server and in 4.12 for UE4Editor -server