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> 4) Post-release checkouts and monitoring How did you ensure that in the past? Sounds to me like it would not really be possible to do this before live users

• toast0 4y ago
  How effectively you can do this depends on how you direct traffic. But I'd do it by having the new version running on production servers where traffic is directed elsewhere. Or, sometimes you can do something similar with feature flags --- push the code everywhere, but only turn on the feature flags for test users at first. Doesn't help if your feature flag or other traffic direction is broken, of course. Also, if you use the same packaging for 'staging' and 'production', staging tests your packaging.