* Create add-data-source-variable.md

* Update templates-and-variables.md

* Update menu.yaml

* Update add-interval-variable.md

* Update menu.yaml

* Update templates-and-variables.md

* Update add-interval-variable.md

* Update add-interval-variable.md

* ad hoc filters

* Update templates-and-variables.md

* Update templates-and-variables.md

* Update add-ad-hoc-filters.md