I agree with much of this, but I should add that there's a difference between Production and Production. That is, whether a certain application or system is "live" is important, but you have to consider the impact of the system as well. In my corner of the corporate world, we define certain systems and processes as business critical if a failure in them could:
- result in loss of revenue
- harm a relationship with a customer
- expose us to legal liability
- or pose a threat to environment, health, and safety
Some systems meet these criteria and some don't. The ones that do have stricter rules for deployments: deploys occur only at certain times, they are handled by an operations team separate from the development team, written instructions are required, a rollback plan is required, QA has to sign off on the thing working in the stage environment, etc. Less-critical systems follow less-stringent rules.
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