Intercept error nginx about SSL, is this a good idea?

Hi everyone, first a big thank you for this forum and the continue work of eva2000 related to Nginx.

I think to create a plugin who has the feature of monitoring a website SSL certificate and check everything is okay

this plugin will be installed in the same server who has all the Server Blocks Nginx, that mean a self hosted monitoring.

I want to avoid resources used cpu and memory, so the functionality of plugin will be different in comparison to traditional monitoring system.

Create a module in Nginx or Lua to intercept all error logs related to SSL, that means intercept this directive error_log

server {
# Server configuration
error_log /var/log/error.log;
}

My main question is, does nginx error_log register (logged) all error related to SSL?
If the above question is true, what do you think about this idea?

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Thank you eva2000