Add new metric definition for on-call notifications [RUN ALL RSPEC] [RUN AS-IF-FOSS]

Merged Sarah Yasonik requested to merge sy-on-call-usage-ping into master

What does this MR do?

Related issue: #321295 (closed)

Adds a new metric for tracking the number of unique users which receive an on-call notification.

Does this MR meet the acceptance criteria?


Availability and Testing


If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
Edited by Sarah Yasonik