| `HELM_UPGRADE_EXTRA_ARGS` | From GitLab 11.11, allows extra options in `helm upgrade` commands when deploying the application. Note that using quotes doesn't prevent word splitting. |
| `INCREMENTAL_ROLLOUT_MODE` | From GitLab 11.4, if present, can be used to enable an [incremental rollout](#incremental-rollout-to-production) of your application for the production environment. Set to `manual` for manual deployment jobs or `timed` for automatic rollout deployments with a 5 minute delay each one. |
| `K8S_SECRET_*` | From GitLab 11.7, any variable prefixed with [`K8S_SECRET_`](#application-secret-variables) is made available by Auto DevOps as environment variables to the deployed application. |
| `KUBE_CONTEXT` | From GitLab 14.5, can be used to select which context to use from `KUBECONFIG`. When `KUBE_CONTEXT` is blank, the default context in `KUBECONFIG` (if any) will be used. A context must be selected when using the [CI/CD tunnel](../../user/clusters/agent/ci_cd_tunnel.md). |
| `KUBE_INGRESS_BASE_DOMAIN` | From GitLab 11.8, can be used to set a domain per cluster. See [cluster domains](../../user/project/clusters/gitlab_managed_clusters.md#base-domain) for more information. |
| `KUBE_NAMESPACE` | The namespace used for deployments. When using certificate-based clusters, [this value should not be overwritten directly](../../user/project/clusters/deploy_to_cluster.md#custom-namespace). |
| `KUBECONFIG` | The kubeconfig to use for deployments. User-provided values take priority over GitLab-provided values. |
| `PRODUCTION_REPLICAS` | Number of replicas to deploy in the production environment. Takes precedence over `REPLICAS` and defaults to 1. For zero downtime upgrades, set to 2 or greater. |
| `REPLICAS` | Number of replicas to deploy. Defaults to 1. |
| `ROLLOUT_RESOURCE_TYPE` | From GitLab 11.9, allows specification of the resource type being deployed when using a custom Helm chart. Default value is `deployment`. |
