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> However, in this instance a previously-unseen software bug was triggered, and instead of retaining the previous known good configuration, the management software instead removed all GCE IP blocks from the new configuration

> Crucially however, a second software bug in the management software did not propagate the canary step’s conclusion back to the push process

I'm sure the devil is in the details, but generally speaking, these are 2 instances of critical code that gets exercised infrequently, which is a good place for bugs to hide.

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