When the user opens an independent service port for the dashboard, the dashboard may access some non-existing files (such as ICO). These not found logs are meaningless.

We can disable these error logs by default.

we can add the directive here:
https://github.com/apache/incubator-apisix/blob/master/bin/apisix#L248

log_not_found off;

here is the directive about log_not_found:
http://nginx.org/en/docs/http/ngx_http_core_module.html#log_not_found