anchor.diff:  
   You should be running Kill Bill version 2021.9 or later. This version
   can be configured to provide its full collection of Kill Bill metrics to
  -datadog (and several other analysis tools). If you open the Kill Bill
  +Datadog (and several other analysis tools). If you open the Kill Bill
   admin page in your browser, it should show that you are
   running the "Kill Bill Premium edition":
   
  
positive.code: Bill has to offer, just add the path `/1.0/metrics` to the URL. Have fun!
  If you find these hard to understand, though, maybe datadog can help.
  
  == Setting up Datadog
  
  You may already be familiar with datadog. If not, this section will
  explain how to get started.
  
  First, go to the https://www.datadoghq.com/[datadog website]. Datadog
  offers a free trial to get started. After the trial, you will be charged
  monthly depending on what types of information you want them to manage.
  To sign up for the free trial, select "GET STARTED FREE" at the top of
  the page.
  
  When you login to datadog you will be taken to the Welcome page. Note
  the series of menu options on the left hand side.
  
  To setup datadog to manage the metrics available from Kill Bill, there
  are just two steps: (1) install the datadog agent in Kill Bill, and (2)
  authorize the transfer of the complete Kill Bill metrics.
  
  == Installing the Agent
  
  The first step in integrating an analysis tool, like datadog, and a
  source of data to analyze, like Kill Bill, is to setup a means to get
  the source to send its data to the analyzer. Datadog does this by
  installing the *datadog agent* in the system producing the data.
  
  In the main datadog menu, select *Integrations*, then scroll down in the
  submenu to select *Agent*. This will show you a page listing all of the
  platforms on which the datadog agent can be installed. Choose *Ubuntu*.
  The next page will show you the single step required for this platform
  to install the agent:
  
  image::metrics-datadog-install.png[align=center]
  
  
  To install the agent, login to your EC2 instance, then copy the line
  shown by datadog to the Ubuntu command line. Press Enter. The agent
  should be installed automatically.
  
  Note that this command already includes the Api Key assigned to you by
  datadog. This will authorize the agent to do its job.
  
  If you are using the Multitier installation, you will have multiple EC2
  instances. The agent should be installed separately for each one.
  
negative.code: 
  Measurements and metrics are an important part of managing your Kill
  Bill system to be sure that performance is optimized and any problems
  can be detected early. Kill Bill collects over 1,300 metrics to show you
  every conceivable view of your system's behavior.
  
  Several third party tools are available to manage and display metrics of
  this type. One popular tool is https://www.datadoghq.com/[Datadog]. This
  package offers a low-cost option to monitor and display whatever metrics
  you may find useful from the Kill Bill collection, including metrics
  that show the performance and resource use of Kill Bill and Kaui
  themselves, and metrics describing the infrastructure on which these
  systems run.
  
  Datadog can be integrated with several types of Kill Bill installations. In this guide we discuss the use of datadog to manage metrics produced
  by two types of implementations on Amazon Web Services (AWS):
  Single Tier and Multitier. With the latest Amazon Machine Image (AMI)
  for Kill Bill, it is very easy to direct the Kill Bill metrics to
  Datadog and work with them in the way that best suits your needs.
  
  == Check Your Kill Bill Version
  
  We assume that you have a working Kill Bill implementation running on
  AWS, using either the
  