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Description of problem:

On very busy systems all of the 'systemd --user' processes will all echo messages that the primary systemd process does.  This creates a massive cascade of logs which is completely unnecessary.

In RHEL 8.3 we added a mount succeeded message and on systems with tons of autofs and users logged in we get every single 'systemd --user' process all echoing the mount succeeded message.

From unit.c in RHEL 8.3.0: 

    void unit_log_success(Unit *u) {
	    assert(u);

	    log_struct(LOG_INFO,
		       "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR,
		       LOG_UNIT_ID(u),
		       LOG_UNIT_INVOCATION_ID(u),
		       LOG_UNIT_MESSAGE(u, "Succeeded."));
    }

Version-Release number of selected component (if applicable):

RHEL 8.3 systemd-239-41.el8_3.1.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Have a user logged in and mount a filesystem

Actual results:

systemd overwhelms logs on very busy systems.

Expected results:

Only the primary systemd process should indicate that these mounts succeeded or this should be hidden behind a debug or other logging.

Additional info:

fix merged to github master branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/186

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4469