By providing CORE_SESSIONS_SESSION_LOG_PATH_PATTERN (e.g. "/log/%Y-%m-%d.log") all
finished sessions will be logged to a file according to the provided strftime-pattern. The
actual value is calculated from when the session closed. CORE_SESSIONS_PERSIST must
be set. Default: not set.
Set CORE_SESSIONS_SESSION_LOG_BUFFER_SEC to the number of seconds the log should be
buffered in memory before persisted to disk. Default 15 seconds.
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