How to disable log rate-limiting in Red Hat Enterprise Linux 7 and later version?

Issue

• We want to log all messages to syslog, what should I add/change in rsyslog.conf config to avoid losing messages?

• Why am I getting the below messages in my RHEL server?

  Apr  7 11:50:35 localhost rsyslogd-2177: imjournal: begin to drop messages due to rate-limiting
  Apr  7 11:50:47 localhost rsyslogd-2177: imjournal: 406 messages lost due to rate-limiting
  Apr  7 12:00:38 localhost rsyslogd-2177: imjournal: begin to drop messages due to rate-limiting
  Apr  7 12:00:48 localhost rsyslogd-2177: imjournal: 391 messages lost due to rate-limiting
  Apr  7 12:19:21 localhost rsyslogd-2177: imjournal: begin to drop messages due to rate-limiting
  

• How do I disable rate limiting using rsyslog on my RHEL server?

• I disabled rate limiting in rsyslog.conf but I'm still missing messages. I see warnings like this in the journal:

  Oct 28 02:07:57 localhost systemd-journal[1864]: Suppressed 97 messages from /
  

• I increased rate limiting in /etc/systemd/journald.conf but I'm still missing messages. I see warnings like this in the journal:

  Oct 28 02:07:57 localhost systemd-journal[1864]: /dev/kmsg buffer overrun, some messages lost.