filter f_fcache_latency { message("LAT_DIAGNOSE_TAG");  };

rewrite r_fcache_latency {
    subst("flashcache_syno: \\[LAT_DIAGNOSE_TAG\\] ", "", value("MESSAGE"));
};

destination d_fcache_latency { file("/var/log/flashcache_latency.log"); };
log { source(src); filter(f_fcache_latency); rewrite(r_fcache_latency); destination(d_fcache_latency); };