Gerrit 2.15, which has just been released, removes the old "Draft" workflow, and replaces it with something new called "WIP" (Work-In-Progress), described in the 2.15 release notes here.

The Gerrit trigger plugin should continue to support Drafts (for when it's used with a pre-2.51 Gerrit), but also needs to support the new WIP workflow.

• In the "Trigger on" section, there is currently an option "Exclude Drafts". "Exclude WIP" needs to be added.
• When we support "Trigger on Draft Published", I guess we need "Trigger on WIP moved to ready" and "Trigger on moved to WIP"

Similarly , there is a new state called Private which should also be handled.