logback-android/src/main/java/ch/qos/logback/core/net/SyslogAppenderBase.java
public void setFacility(String facilityStr) {
    if (facilityStr != null) {
      facilityStr = facilityStr.trim();
    }
    this.facilityStr = facilityStr;
  }
public void setFacility(String facilityStr) {
    if (facilityStr != null) {
      facilityStr = facilityStr.trim();
    }
    this.facilityStr = facilityStr;
  }
The <b>Facility</b> option must be set one of the strings KERN, USER, MAIL,
DAEMON, AUTH, SYSLOG, LPR, NEWS, UUCP, CRON, AUTHPRIV, FTP, NTP, AUDIT,
ALERT, CLOCK, LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4, LOCAL5, LOCAL6,
LOCAL7. Case is not important.

<p>
See {@link SyslogConstants} and RFC 3164 for more information about the
<b>Facility</b> option.
@param facilityStr the name of the desired facility