Eventstreams tries to install node-rdkafka@2.5.1 which depends on librdkafka@0.11.6, however, we only have librdkafka@0.11.3 installed and backported into Jessie, so the build is failing and we obviously can't deploy eventstreams.
I believe that we should restrict the node-rdkafka package version to 2.3.X in event streams dependencies now and not try upgrading librdkafka to 0.11.6 right now since librdkafka 1.0 is coming out very soon (it's RC7 now).