anchor.diff:  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
  +Several third-party tools are available to manage and display metrics of
   this type. One popular tool is https://www.newrelic.com/[New Relic]. This
   package offers a low-cost option to monitor and display whatever metrics
   you may find useful from the Kill Bill collection, including metrics
  
positive.code: AWS, using either the
  https://docs.killbill.io/latest/aws-singletier.html[Single Tier] or
  https://docs.killbill.io/latest/aws-multitier.html[Multitier]
  installation options. The single tier option runs Kill Bill, Kaui, the
  MariaDB database and the nginx load balancer on a single AWS EC2
  instance. This is suitable for quick deployment and for testing and
  development. The multitier option runs Kill Bill and Kaui on two or more
  separate EC2 instances, and uses an AWS RDS database manager along with
  an AWS load balancer. This is an attractive option for many production
  uses.
  
negative.code: themselves, and metrics describing the infrastructure on which these
  systems run.
  
  New Relic can be integrated with several types of Kill Bill installations. In this guide we discuss the use of New Relic to manage metrics produced
  by two types of implementations on Amazon Web Services (AWS):
  single-tier and multi-tier. With the latest Amazon Machine Image (AMI)
  for Kill Bill, it is very easy to direct the Kill Bill metrics to
  New Relic and work with them in the way that best suits your needs.
  
  