jujiale opened a new issue, #10606:
URL: https://github.com/apache/apisix/issues/10606

   ### Description
   
   hello:
     I find in our prd apisix server, in grafana, the request latency is lower 
than  upstream latency ,such as the following picture, I want to know if have 
any scenarios cloud result in such situation.
   
   as I find in logutil.lua
   the request latency calculated by **ngx.now() - ngx.req.start_time()** while 
upstream_latency is **$upstream_response_time**, so why the follwing picture's 
problem is occured.
   
   need your help, thanks a  lot.
   
   
![image](https://github.com/apache/apisix/assets/48037235/6ed596d5-4256-4300-b76f-ca876f5c3d61)
   
   
   ### Environment
   
   - APISIX version (run `apisix version`):2.12.0
   - Operating system (run `uname -a`):3.10.0-1160.71.1.el7.x86_64
   - OpenResty / Nginx version (run `openresty -V` or `nginx -V`): 
openresty/1.21.4.1
   - etcd version, if relevant (run `curl 
http://127.0.0.1:9090/v1/server_info`):3.5.0
   - APISIX Dashboard version, if relevant:
   - Plugin runner version, for issues related to plugin runners:
   - LuaRocks version, for installation issues (run `luarocks --version`):
   


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