[Objective 1][KR4] Maintain downtime SLA at 15 mins per month and reduce other critical oncall incidents time from 4 hours to 2 hours per month

[sramalin]

• Test coverage should be measured and build should be failing when it drops
• DoD should include 100% line coverage of tests.
• Make sure all the scenarios are covered and tested properly to avoid downtime
• Validate AMP pages in tests (by mocking)
• Having a sample publisher and run tests against it for every build. (Functional tests)
• Validator tests against real publishers (staging)
• Start measuring number of defect leakages