Also perhaps relevant is that the latest audit package in Fedora 24 even has:

~]# cat /usr/share/doc/audit/rules/22-ignore-chrony.rules
## This rule suppresses the time-change event when chrony does time updates
-a never,exit -F arch=b64 -S adjtimex -F auid=unset -Fuid=chrony -F subj_type=chronyd_t
-a never,exit -F arch=b32 -S adjtimex -F auid=unset -Fuid=chrony -F subj_type=chronyd_t