Enabling the remote observation and choosing the channel is now covered by XCOMMONS-3289.
Then for actual jgroup configuration, there are two choices:
with multicast it's generally possible to have a configuration file which is the same on all instances
jgroups configuration files natively support variables which values can be provided through system properties (but not environment variables AFAIK)
So I think this is good enough. Don't hesitate to create another issue if you feel that we really need a way to add support for environment variables in jgroups configuration files.
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