The renderer file
A renderer modifies the rendering of the query result to convert its format, make statistics, or calculate sums for example. It is optional.
It does not have a default name. Its default extensions are .yml, .yaml, and .j2.
To use a renderer, you must call the renderer file from a renderer field of a
query. You can omit the extension only if it is one of the default extensions.
For renderer examples, see Getting started with the analysis of the deployment results.