How are graphs of the frequency of requests / statuses of responses from the web server made?

Question

Nginx

Hello!
I often see how different companies post graphs where you can see the processing time of a request, the number of requests per second, and so on.
Is it really all done by simply parsing the web server log files?
If so, what are the recognized solutions used to analyze nginx logs?
Thanks

Answer 1

Look towards new relic. There are a bunch of plugins for monitoring and statistics on the operation of services. For nginx including.

Answer 2

Yes, logs are parsed.
Of course, not every minute the entire 60 GB log, but with "remembering" the last place for the next launch.
ganglia + logster.