writing a global lua variable ('resty') which may lead to race conditions between concurrent requests, so prefer the use of 'local' variables

[jclivi]

What's wrong with this?

_G write guard:12: writing a global lua variable ('resty') which may lead to race conditions between concurrent requests, so prefer the use of 'local' variables
stack traceback:
[C]: in function 'module'
lualib/resty/mongol/init.lua:1: in main chunk
[C]: in function 'require'