munin-monitoring/contrib — pull request #29 by mckoss (2012-02-13 19:00:09+00:00)
Title: Replacement for nginx_memory and ngnix_memory (sic)

Both of these scripts had problems for me.

1) Counted total of virtual memory, not working set size (the former is not really a scarce resource).
2) Had a bug including ANY process with the work nginx in it.

I replaced with a simple bash plugin that returns the sum of the working set (RSS) bytes.