[Observium] syslog filters

Hi, I'm using feature syslog on observium 18.10.9472, but unable it filters for messages.

$config['syslog']['filter'][] = '%%10DRV_DEM/5/FAN WARNING(t):- 1 - Info: Fan4 is ERROR now.';

i restarted rsyslog service

The syslog read entries on a mysql table.

somebody can helpme?