Multi-line logging in Openshift v3

Issue

• We have tested the 3.1 centralized logging feature and saw that (like in v2) you do not treat multiline logging messages. We would like to have some way of handling multiline messages, and out-of-the-box support for this in the JBOSS image.
• In v2, we used rsyslog to store the data in a file. Now you provide an elasticsearch/kibana access, but this does not work properly if you do not support multiline messages. Main use case are java exceptions : if you cannot keep the stacktrace as a whole, your metrics in kibana are useless and when you search on a given exception, you do not have the contaxt
• Instead of using docker-like logging to stdout and treating that line based, you should be able to cope with logging in a multiline capable format (like JSON). The transport/storage/acces is ok, but then the log message is preserved, and not broken up into multiple independent lines.
• We would like to achieve this by provoking a stacktrace in a JBOSS image and make sure it is logged as a single event. The result in kibana should show the complete sctacktrace, not a single line of it.