Use LogFilterPatterns from the unit's cgroup xattr in order to keep or discard log messages before writing them to the journal. When a log message is discarded, it won't be written to syslog, console... either. When a native, syslog, or standard output log message is received, systemd-journald will process it if it matches against at least one allowed pattern (if any) and none of the denied patterns (if any).
System and Service Manager
Details
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