agent can not handle "access_log off" in nginx configuration

[defanator]

If access_log off; is present in nginx configuration, agent treats the off part as a file name and throws the error:

time="2023-01-27T05:45:46Z" level=warning msg="NGINX Access log off is not readable or is disabled. Please make it readable and enabled in order for NGINX metrics to be collected."

The off is a special value that actually disables access log in a given block: https://nginx.org/en/docs/http/ngx_http_log_module.html#access_log

[Dean-Coakley]

It makes sense to handle this case so that no warning is logged. Thanks for raising this issue @defanator

We'll fully investigate and fix shortly.