Merge branch 'JobV-master-patch-08985' into 'master'

update issue template to encourage collaboration and metrics

See merge request gitlab-org/gitlab-ce!18972

.gitlab/issue_templates/Feature Proposal.md

-### Description
-(Include problem, use cases, benefits, and/or goals)
+### Problem to solve
+### Further details
+
+(Include use cases, benefits, and/or goals)
 ### Proposal
+### What does success look like, and how can we measure that?
+
+(If no way to measure success, link to an issue that will implement a way to measure this)
+
 ### Links / references
 /label ~"feature proposal"