目的

To suppress cluster warning messages in the Confluence log files.

ソリューション

 Under Logging and Profiling in Confluence Admin, either (or both) of the following packages are set to DEBUG:

com.atlassian.confluence.cluster.safety
com.atlassian.confluence.cluster

Please change them to INFO, and the warning messages in logs should disappear. 

 Please note that these changes are not permanent and it will change back to their default values when Confluence restarts. To make the changes permanent you will need to do the same modification through the log4j.properties file.