What is a Failed Deployment?

When talking about DevOps, the goal is to produce better software over time. Both better quality as well as a smoother process of getting bits to your clients. There are a number of metrics typically used to measure how well a software team is performing, and one of the things is Change fail percentage. This is the percentage of deployments that causes a failure in production, which means a hotfix or rollback is needed. Essentially we need to fail forward or roll back to get things working.

For most people, a failed deployment means downtime. I've caused a service to be down (or a page or an app) because of a code change I made. This includes the database, as a schema change could cause the application to fail. Maybe we've renamed something (always a bad idea) and the app hasn't updated. Maybe we added a new column to a table and some other code has an insert statement without a column list that won't run. There are any number of database changes that might require a hotfix or rollback and could be considered a failure.

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