When using includes, using YAML anchors and aliases is imperative. The contents of the includes should make use of anchors in order to reference the anchored definitions by an alias.

      # Example: anchor a scalar value
      anyProperty: &nameAnchor anchoredContent

      # reuse it by alias:
      anyOtherPropery: *nameAnchor

      # which is equivalent to:
      anyOtherPropery: anchoredContent
    

Example: anchor a code snippet

      # define a code snippet anchor
      anyProperty: &codeSnippetName
        - a
        - b
        - c

      # reuse the snippet
      myProperty: *codeSnippetName

      # which is equivalent to
      myProperty:
        - a
        - b
        - c