Why does systemctl status output "Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable"?

Solution In Progress - Updated -

Issue

I can see the following Warning message when checking the status by systemctl status

Raw
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

What does this mean ?
Why does this message appear?
What should I do for the message?

i.e.

Raw
# systemctl status systemd-journald

● systemd-journald.service - Journal Service
   Loaded: loaded (/usr/lib/systemd/system/systemd-journald.service; static; vendor preset: disabled)
   Active: active (running) since 2019-03-28 10:49:35 JST; 5 months 16 days ago
     Docs: man:systemd-journald.service(8)
           man:journald.conf(5)
 Main PID: 2616 (systemd-journal)
   Status: "Processing requests..."
   CGroup: /system.slice/systemd-journald.service
           mq2616 /usr/lib/systemd/systemd-journald

Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

Environment

Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 7

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