to2false opened a new issue #4137: URL: https://github.com/apache/apisix/issues/4137
### Issue description ### Environment * apisix version (cmd: `apisix version`): 2.4 * OS (cmd: `uname -a`): Linux gateway 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux * OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): * etcd version, if have (cmd: run `curl http://127.0.0.1:9090/v1/server_info` to get the info from server-info API): v3.4.13 * apisix-dashboard version, if have: 2.5 * luarocks version, if the issue is about installation (cmd: `luarocks --version`): ### Minimal test code / Steps to reproduce the issue  I can't reproduce it, it only happens occasionally now additional, the server load is not high. ### What's the actual result? (including assertion message & call stack if applicable) - metrics requested over 30s ### What's the expected result? - metrics requested should be quick -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
