convdev docs

doc/user/admin_area/monitoring/convdev.md

+# Conversational Development Index
+
+>**Notes:**
+  - Conversational Development Index was [introduced][ce-30469] in GitLab 9.3.
+
+Conversational Development Index (ConvDev) gives you an overview of your entire
+instance's feature usage, from idea to production. It looks at your usage in the
+past 30 days, averaged over the number of active users in that time period. It also
+provides a lead score per feature, which is calculated based on GitLab's analysis
+of top performing instances, based on usage ping data that GitLab has collected.
+Your score is compared to the lead score, expressed as a percentage. The overall
+index score is an average over all your feature scores.
+
+The page also provides helpful links to articles and GitLab docs, to help you improve
+your scores.
+
+Your GitLab instance's usage ping must be activated in order to use this feature.
+Usage ping data is aggregated on GitLab's servers for analysis. Your usage information
+is not sent to any other GitLab instances. If you have just started using GitLab,
+it may take a few weeks for data to be collected before this feature is available.
+
+This feature is accessible only to a system admin, at Admin Area > Monitoring > ConvDev Index.
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