code: @Beta
      public static boolean containsMappingFor(final String eventType) {
          if (eventType == null || eventType.isEmpty()) {
              return false;
          } else {
              return systemEventMappings.containsKey(canonicalizeEventType(eventType));
          }
      }
docs: Checks if a mapping exists for the given type.
  
  @param eventType the event type.
  @return true if mapping exists, false otherwise.