Slack Notification Template: Need More Docs / Link To Docs

[firezdog]

It isn't clear what variables are available to use in build templates or the general access pattern. The section on the "replace" filter raises a major issue about properly parsing build information fields, but the provided example cannot be used as is because {{ ... }} itself occurs within a quoted string, and it is not immediately clear how the quotes in the string literal parameters should themselves be escaped.