Import Memory usage of Apache processes into Datadog

apache-memory.rb

require 'rubygems'
require 'statsd'

statsd = Statsd.new

while true do
  ps = `ps -C apache2 -o rss --no-header`
  memory = ps.split("\n")
  memory = memory.collect{|mem| mem.strip}
  memory.each do |mem|
   statsd.histogram('apache.rss_memory', mem)
  end
  puts "Sleeping for 10 seconds"
  sleep(10)
end

datadog.json

{
  "viz": "timeseries",
  "requests": [
    {
      "q": "max:apache.rss_memory.max{*}",
      "style": {
        "width": "thin",
        "type": "dashed"
      }
    },
    {
      "q": "max:apache.rss_memory.median{*}",
      "style": {
        "width": "normal"
      }
    },
    {
      "q": "max:apache.rss_memory.95percentile{*}",
      "style": {
        "width": "normal",
        "type": "solid"
      }
    }
  ],
  "events": [],
  "markers": [
    {
      "type": "error dashed",
      "value": "y = 262144",
      "label": "Current limit - 256MB"
    },
    {
      "type": "warning dashed",
      "value": "y = 196608",
      "label": "Proposed limit - 192MB"
    }
  ]
}