Merge pull request kubernetes#3596 from binman-docker/master

Add documentation for balancing-ignore-label flag

Author: k8s-ci-robot

cluster-autoscaler/FAQ.md

@@ -666,6 +666,7 @@ The following startup parameters are supported for cluster autoscaler:
 | `max-inactivity` | Maximum time from last recorded autoscaler activity before automatic restart | 10 minutes
 | `max-failing-time` | Maximum time from last recorded successful autoscaler run before automatic restart | 15 minutes
 | `balance-similar-node-groups` | Detect similar node groups and balance the number of nodes between them | false
+| `balancing-ignore-label` | Define a node label that should be ignored when considering node group similarity. One label per flag occurrence. | ""
 | `node-autoprovisioning-enabled` | Should CA autoprovision node groups when needed | false
 | `max-autoprovisioned-node-group-count` | The maximum number of autoprovisioned groups in the cluster | 15
 | `unremovable-node-recheck-timeout` | The timeout before we check again a node that couldn't be removed before | 5 minutes