+ # update_collections makes a log collection that includes all of the logs
+ # for all of the containers associated with this request. For requests
+ # that are retried, this is the primary way users can get logs for
+ # failed containers.
+ # The code below makes a log collection that is a verbatim copy of the
+ # container's logs. This is required for container reuse: a container
+ # will not be reused if the owner cannot read a collection with its logs.
+ # See the "readable log" section of Container.find_reusable().