Publicly? Rarely. (Here's an example, though, from 2010: https://www.facebook.com/notes/facebook-engineering/more-details-on-todays-outage/431441338919 https://

Publicly? Rarely. (Here's an example, though, from 2010: https://www.facebook.com/notes/facebook-engineering/more-details-on-todays-outage/431441338919 https://www.facebook.com/notes/facebook-engineering/more-det...) Internally? Absolutely, for, at minimum, every user-visible outage.