Add Web IDE preview success metrics

Chad Woolleyrequested to merge
add-web-ide-preview-success-metrics into master

What does this MR do and why?

Adds usage ping metrics to be emitted each time Web IDE Live Preview is successfully initialized.

Redis key is WEB_IDE_PREVIEWS_SUCCESS_COUNT

Screenshots or screen recordings

Screen_Shot_2022-01-21_at_6.40.28_PM

How to set up and validate locally

Create a project, and create the following files in the Web IDE:

index.html

<html>
<body>
<h1>THIS IS HTML!</h1>
</body>
</html>

package.json

{
 "name": "html",
  "version": "1.0.0",
  "description": "html",
  "main": "index.html"
}

Open the live preview - middle icon on right side of Web IDE.

Open Redis to check count was incremented:

$ redis-cli -s ~/workspace/gitlab-development-kit/redis/redis.socket
redis /Users/cwoolley/workspace/gitlab-development-kit/redis/redis.socket> GET WEB_IDE_PREVIEWS_SUCCESS_COUNT
"4"

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

related: #349388

cc @pslaughter @ericschurter

Edited by Chad Woolley

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