rollingPolicy maxHistory=30; fileNamePattern
${logs-name}-warn.%d

.%i.log
Will remove the logs from another appender (maxHistory=0); with fileNamePattern
${logs-name}.%d

.%i.log
-------
Probably short description is wrong.
Full story:
On our servers some log files older then 30 hours are disappearing.
We have two sets of log files WARN and DEBUG

the maxHistory set to 0 for DEBUG logs. But they are disappearing.
the maxHistory set to 30 for WARN logs that have a different name pattern