Merge branch 'update-browser-perf-testing-example-doc' into 'master'

Update Browser Performance Testing Example

See merge request gitlab-org/gitlab-ce!17249

doc/ci/examples/browser_performance.md

@@ -13,16 +13,20 @@ Once you set up the Runner, add a new job to `.gitlab-ci.yml`, called `performan
   services:
     - docker:dind
   script:
+    - mkdir gitlab-exporter
+    - wget -O ./gitlab-exporter/index.js https://gitlab.com/gitlab-org/gl-performance/raw/10-5/index.js
     - mkdir sitespeed-results
-    - docker run --shm-size=1g --rm -v "$(pwd)":/sitespeed.io sitespeedio/sitespeed.io --outputFolder sitespeed-results https://my.website.com
+    - docker run --shm-size=1g --rm -v "$(pwd)":/sitespeed.io sitespeedio/sitespeed.io:6.3.1 --plugins.add ./gitlab-exporter --outputFolder sitespeed-results https://my.website.com
+    - mv sitespeed-results/data/performance.json performance.json
   artifacts:
     paths:
+    - performance.json
     - sitespeed-results/
 ```
 
-This will create a `performance` job in your CI/CD pipeline and will run Sitespeed.io against the webpage you define. The full HTML Sitespeed.io report will be saved as an artifact, and if you have Pages enabled it can be viewed directly in your browser. For further customization options of Sitespeed.io, including the ability to provide a list of URLs to test, please consult their [documentation](https://www.sitespeed.io/documentation/sitespeed.io/configuration/).
+This will create a `performance` job in your CI/CD pipeline and will run Sitespeed.io against the webpage you define. The GitLab plugin for Sitespeed.io is downloaded in order to export key metrics to JSON. The full HTML Sitespeed.io report will also be saved as an artifact, and if you have Pages enabled it can be viewed directly in your browser. For further customization options of Sitespeed.io, including the ability to provide a list of URLs to test, please consult their [documentation](https://www.sitespeed.io/documentation/sitespeed.io/configuration/).
 
-For [GitLab Premium](https://about.gitlab.com/products/) users, a performance score can be automatically
+For [GitLab Premium](https://about.gitlab.com/products/) users, key metrics are automatically
 extracted and shown right in the merge request widget. Learn more about [Browser Performance Testing](https://docs.gitlab.com/ee/user/project/merge_requests/browser_performance_testing.html).
 
 ## Performance testing on Review Apps
@@ -42,9 +46,15 @@ A simple `performance` job would look like:
     - docker:dind
   script:
     - export CI_ENVIRONMENT_URL=$(cat environment_url.txt)
+    - mkdir gitlab-exporter
+    - wget -O ./gitlab-exporter/index.js https://gitlab.com/gitlab-org/gl-performance/raw/10-5/index.js
     - mkdir sitespeed-results
-    - docker run --shm-size=1g --rm -v "$(pwd)":/sitespeed.io sitespeedio/sitespeed.io --outputFolder sitespeed-results $CI_ENVIRONMENT_URL
+    - docker run --shm-size=1g --rm -v "$(pwd)":/sitespeed.io sitespeedio/sitespeed.io:6.3.1 --plugins.add ./gitlab-exporter --outputFolder sitespeed-results "$CI_ENVIRONMENT_URL"
+    - mv sitespeed-results/data/performance.json performance.json
   artifacts:
     paths:
+    - performance.json
     - sitespeed-results/
 ```
+
+A complete example can be found in our [Auto DevOps CI YML](https://gitlab.com/gitlab-org/gitlab-ci-yml/blob/master/Auto-DevOps.gitlab-ci.yml).
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