private Instant localSessionCreated(LocalSession session) {
        File sessionDir = tenantFileSystemDirs.getUserApplicationDir(session.getSessionId());
        return sessionDir.exists() ? created(sessionDir) : Instant.EPOCH;
    }
A session for which we don't have a watcher, i.e. hitherto unknown to us.

@param sessionId session id for the new session
configserver/src/main/java/com/yahoo/vespa/config/server/session/SessionRepository.java