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I think the "single dependency" was moreso about the technology stack, not the number of instances of whatever the technology is.


They mention that one of the reasons is having fewer things that can fail and bring down your system... two separate PG systems doubles the failure chance


If you don't maintain redundancy (i.e. more than one instance), you will be 100% certain to have a service outage at some point in your future.


Sure, but you still have double the chance of failure.. Two distinct PG clusters you depend on are twice as likely to have an outage as one.




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