Crucible 4.3 also introduces new dialog that displays warning and error messages, which appear when there are problems with transition processes. Using our new API you can customise these dialogs to your needs to show, for example, names of users who have not finished their reviews.
I am not comfortable writing this plugin.
Is there any plugin already available for this feature which we can use ?
As far as I know, there are no apps available for this. You can search for existing add ons on the marketplace site: https://marketplace.atlassian.com/addons/app/fisheye-crucible
Would this be enough to get you started? If not, can you share here your use case so that a member of the community can help in achieving what you are looking for?
Thanks, Caterina - Atlassian