Nice write-up! If no new requests from users are arriving in a siloed AZ, internal services in that AZ will naturally quiesce as they have no new work to d

Nice write-up! If no new requests from users are arriving in a siloed AZ, internal services in that AZ will naturally quiesce as they have no new work to do. Not necessarily because, due to some bug, there may be resource-hungry jobs running indefinitely. (Slack's engineers must have considered this; I am just nitpicking this particular part of the text.)