
This allows you to extend lists in yaml config. This is useful, for example, in prometheus.yml, where it would be nice to be able to extend the scrape_configs to include exporters that aren't packaged with kolla-ansible. This would provide a mechanism to do so. Change-Id: I7a10e363f42e8ffaae3c0d2c2a758853e2cab7e1 Related: blueprint custom-prometheus-targets