logback-android/src/main/java/ch/qos/logback/classic/boolex/OnMarkerEvaluator.java
public boolean evaluate(ILoggingEvent event) throws NullPointerException,
      EvaluationException {

    Marker eventsMarker = event.getMarker();
    if (eventsMarker == null) {
      return false;
    }

    for (String markerStr : markerList) {
      if (eventsMarker.contains(markerStr)) {
        return true;
      }
    }
    return false;
  }
public boolean evaluate(ILoggingEvent event) throws NullPointerException,
      EvaluationException {

    Marker eventsMarker = event.getMarker();
    if (eventsMarker == null) {
      return false;
    }

    for (String markerStr : markerList) {
      if (eventsMarker.contains(markerStr)) {
        return true;
      }
    }
    return false;
  }
Return true if event passed as parameter contains one of the specified
user-markers.