@Override
    public String getToApp(Map<String, String> tagsWithStr) {
        return tagsWithStr.get(RpcSpanTags.REMOTE_APP);
    }
Instantiates a new Rpc client stat json reporter.

@param statTracerName   the stat tracer name
@param rollingPolicy    the rolling policy
@param logReserveConfig the log reserve config
tracer/tracer-opentracing/src/main/java/com/alipay/sofa/rpc/tracer/sofatracer/log/stat/RpcClientStatJsonReporter.java