In addition to collecting telemetry from our production services and environments, we must also collect telemetry from our deployment pipeline when important events occur, such as when our automated tests pass or fail and when we perform deployments to any environment. We should also collect telemetry on how long it takes us to execute our builds and tests. By doing this, we can detect conditions that could indicate problems, such as if the performance test or our build takes twice as long as normal, allowing us to find and fix errors before they go into production.
