apollo-core/src/main/java/com/ctrip/framework/apollo/tracer/Tracer.java/Tracer/logError
class Tracer:  public static void logError(Throwable cause) {
    try {
      getProducer().logError(cause);
    } catch (Throwable ex) {
      logger.warn("Failed to log error for cause: {}", cause, ex);
    }
  }