Best place for metrics module

[Maxim Dounin]

Hello!

On Thu, May 21, 2015 at 08:22:43AM -0400, donatasm wrote:

> I want to write my custom nginx module for measuring request processing time
> for every HTTP request received. I need to start counting request processing
> time as early as nginx receives first byte of a request and finish, when it
> sends the last byte in a response.  What would the best place be in nginx
> request processing pipeline to plug in my module and these measuring hooks?

The $request_time variable looks like what you need, see 
http://nginx.org/r/$request_time.

-- 
Maxim Dounin
http://nginx.org/