Issue #16349 has been reported by bughit (bug hit).

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Bug #16349: Logger shift_age of 0 disables shift_size
https://bugs.ruby-lang.org/issues/16349

* Author: bughit (bug hit)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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shift_age is documented as: Number of old log files to keep, or frequency of rotation (daily, weekly or monthly). Default value is 0.
shift_size is documented: Maximum logfile size in bytes (only applies when shift_age is a number). Defaults to 1048576 (1MB).

Given the above, a shift_age of 0 should prevent the retention of old log files, but maximum size (shift_size) should still be enforced.

But it's not: https://github.com/ruby/ruby/blob/master/lib/logger/log_device.rb#L124

So either the behavior or the documentation is wrong.



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