====== R ======

  * Red/Black deployment: 
    * a lot like [[gcp:b|Blue/Green deployment]], but only one of the versions ever gets traffic at any point in time.
    * Compare [[gcp:r|Rolling updates]]
  * Region: 
    * A geographic area within a [[gcp:l|Location]] containing multiple [[gcp:z|Zone]]s, in which GCP resources can be allocated.
    * Their names are structured: ''<location>-<region><suffix>'', e.g. ''europe-west9''
  * RIS = Resilient [[wp>IT]] Strategy
  * Role: in [[gcp:i|IAM]], the object of a policy
    * is a collection of permissions
    * Compare [[gcp:p|Principal]]
  * Rolling updates: 
    * A subset of application instances, instead of all of them, is upgraded at the same time.
    * This method requires no downtime.
    * Compare: [[gcp:b|Blue/Green deployment]], [[gcp:r|Red/Black deployment]]
  * RPO = Recovery Point Objective.
    * The quantity of data that can be acceptably lost during an incident
    * Compare: [[gcp:r|RTO]]
  * RPS = Request Per Second
  * RTO = Recovery Time Objective
    * The maximum unavailability duration for an application, not necessarily meaning data loss, but also including time to restore
    * Compare: [[gcp:r|RPO]]