@Override
    public String getFromApp(Map<String, String> tagsWithStr) {
        return tagsWithStr.get(RpcSpanTags.REMOTE_APP);
    }
RpcServerStatReporter

@author <a href=mailto:guanchao.ygc@antfin.com>GuanChao Yang</a>
tracer/tracer-opentracing/src/main/java/com/alipay/sofa/rpc/tracer/sofatracer/log/stat/RpcServerStatJsonReporter.java