The message that the "journal begins … ends …" has been always confusing to users. (Beforeb91ae210e6it was "logs begin … end …" which was arguably even more confusing, but really the change inb91ae210e6didn't substantially change this.) When the range shown is limited (by -e, -f, --since, or other options), it doesn't really matter to the user what the oldest entries are, since they are purposefully limiting the range. In fact, if we are showing the last few entries with -e or -f, knowing that many months the oldest entries have is completely useless. And when such options are *not* used, the first entry generally corresponds to the beginning of the range shown, and the last entry corresponds to the end of that range. So again, it's not particularly useful, except when debugging journalctl or such. Let's just treat it as a debug message. Fixes #21491.
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