L'optimisme, ce n'est pas le refus de voir ce qui ne va pas, c'est le désir de ne pas s'y attarder. // Donne moi le courage de changer les choses que je peux changer, la sérénité d'accepter celles que je ne peux pas changer, et la sagesse de distinguer entre les deux. (Marc Aurèle) // Don't raise your voice; improve your argument. (Desmond Tutu) // Be the change you want to see in the world. (Gandhi)


Because at product launch time, 
the code delivering the new functionality is already in production. 
Months prior to the launch, Development has been deploying code into production, 
invisible to the customer, but enabling the feature to be run and tested by internal staff. 
At the culminating moment when the feature goes live, 
no new code is pushed into production. 
Instead, we merely change a feature toggle or configuration setting. 
The new feature is slowly made visible to small segments of customers,
automatically rolled back if something goes wrong.

(In The Phoenix Project, about DevOps)

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