ScriptExecuter 
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If you want to run some small Shell or Ruby script on server and get some metrics as result - ScriptExecuter is what you need!
PROFIT: You shouldn't create each time new plugin to get needed metrics. 

Options: 
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script_lang:
  default: shell
  name: Script Language 
  notes: Supported languages shell and ruby

exec_script:
  default: ps aux | grep httpd | wc -l
  name: Script for execution
  notes: This script will be executed on the server

value_name:
  default: value
  name: Value Name
  notes: Name for aggregatable values