logback-android/src/main/java/ch/qos/logback/core/ContextBase.java
public String getProperty(String key) {
    if (CONTEXT_NAME_KEY.equals(key))
      return getName();

    return (String) this.propertyMap.get(key);
  }
public String getProperty(String key) {
    if (CONTEXT_NAME_KEY.equals(key))
      return getName();

    return (String) this.propertyMap.get(key);
  }
Given a key, return the corresponding property value. If invoked with
the special key "CONTEXT_NAME", the name of the context is returned.

@param key the property's key
@return the string value associated with the key