anchor.diff:  Test Analytics uses the variables in the `run_env` attribute to populate test information:
   
   * if you're making the request in a Buildkite pipeline, you can use the Buildkite environment variables to set the metadata automatically, like in the following example:
  -* if you're making it elsewhere, you'll need to [set them yourself](#environment-variables-other-ci-providers-and-integrations)
  -
  -
  +* if you're making the request elsewhere, [set the environment variables](#environment-variables-other-ci-providers-and-integrations) yourself
   
   Test Analytics uses the variables in the `run_env` attribute to populate test information. The only *required* variable is `key`, but other Test Analytics features such as linking back to the originating build, do require the [other variables](#environment-variables-other-ci-providers-and-integrations) to work.
   
  
positive.code: |--------------------------------|------------------------------------------------------------------------------------------|
  | `BUILDKITE_ANALYTICS_KEY`      | a unique key for the build that initiated the Test Analytics run<br />`BUILDKITE_BUILD_ID` |
  | `BUILDKITE_ANALYTICS_URL`      | URL that links to the build <br /> `BUILDKITE_BUILD_URL`                                 |
  | `BUILDKITE_ANALYTICS_BRANCH`   | the branch or ref that this run is for<br />`BUILDKITE_BRANCH`                           |
  | `BUILDKITE_ANALYTICS_SHA`      | the commit sha for the head of the branch<br />`BUILDKITE_COMMIT`                        |
  | `BUILDKITE_ANALYTICS_NUMBER`   | the build number of the build<br />`BUILDKITE_BUILD_NUMBER`                              |
  | `BUILDKITE_ANALYTICS_JOB_ID`   | the id of a job within the build<br />`BUILDKITE_JOB_ID`                                 |
  
negative.code: 
  The only required environment variable is the unique key for the build that initiated the Test Analytics run (`BUILDKITE_ANALYTICS_KEY`).
  
  If you're not using CI, you can still use Test Analytics by running the [RSpec integration](#integrating-with-rspec), [JUnit import](#importing-junit-xml), or [JSON import](#importing-json), yourself to upload data to Test Analytics.
  
  ### RSpec on Buildkite
  
  