private String statKeySplit(StatMapKey statKey) {
        JsonStringBuilder jsonBufferKey = new JsonStringBuilder();
        Map<String, String> keyMap = statKey.getKeyMap();
        jsonBufferKey.appendBegin();
        for (Map.Entry<String, String> entry : keyMap.entrySet()) {
            jsonBufferKey.append(entry.getKey(), entry.getValue());
        }
        jsonBufferKey.appendEnd(false);
        return jsonBufferKey.toString();
    }
Get zone

@param tagsWithStr tags
@return zone
tracer/tracer-opentracing/src/main/java/com/alipay/sofa/rpc/tracer/sofatracer/log/stat/AbstractRpcStatJsonReporter.java