+Any user may create Log entries for any event they find useful. User-generated Logs have no intrinsic meaning to other users or to the Arvados system itself; it is up to each user to choose appropriate log event types and summaries for their project.
+
+h3. System Logs
+
+Arvados uses Logs to record creation, deletion, and updates of other Arvados resources.
+
+h2. Resource
+
+Each Log has, in addition to the usual "attributes of Arvados resources":{{site.baseurl}}/api/resources.html:
+
+table(table table-bordered table-condensed).
+|_. Attribute|_. Type|_. Description|_. Example|
+|object_uuid|string|||
+|event_at|datetime|||
+|event_type|string|A user-defined category or type for this event.|@LOGIN@|
+|summary|text|||
+|properties|hash|||
+
+h2. Methods
+
+h3. create