apollo-core/src/main/java/com/ctrip/framework/apollo/tracer/Tracer.java/Tracer/logEvent
class Tracer:  public static void logEvent(String type, String name, String status, String nameValuePairs) {
    try {
      getProducer().logEvent(type, name, status, nameValuePairs);
    } catch (Throwable ex) {
      logger.warn("Failed to log event for type: {}, name: {}, status: {}, nameValuePairs: {}",
          type, name, status, nameValuePairs, ex);
    }
  }