```yaml
app: istio-gateway
istio: gateway # the release name with leading istio- prefix stripped
```

If your existing installation doesn't follow these names, you can override them. For example, if you have resources named `my-custom-gateway` with `selector` labels
`foo=bar,istio=ingressgateway`:

```yaml
name: my-custom-gateway # Override the name to match existing resources
labels:

  # Should be installed in a separate namespace, to minimize access to config
  gateways:
    istio-egressgateway:
      name: istio-egressgateway
      ports:
      - port: 80
        targetPort: 8080
        name: http2
        protocol: TCP
      - port: 443
        name: https
        targetPort: 8443
        protocol: TCP

      labels:
        app: istio-egressgateway
        istio: egressgateway

      # checks always work. https://github.com/istio/istio/issues/12503
      - port: 15021
        targetPort: 15021
        name: status-port
        protocol: TCP
      - port: 80
        targetPort: 8080
        name: http2
        protocol: TCP
      - port: 443
        targetPort: 8443
        name: https
        protocol: TCP

      # Scalability tuning
      # replicaCount: 1
      rollingMaxSurge: 100%

datasources:
  datasources.yaml:
    apiVersion: 1
    datasources:
      - name: Prometheus
        type: prometheus
        orgId: 1
        url: http://prometheus:9090
        access: proxy
        isDefault: true
        jsonData:
          timeInterval: 5s
        editable: true
      - name: Loki
        type: loki
        orgId: 1

`kube.Client` just bundles these all in one place, so we have a single object to pass around anywhere we need Kubernetes access.
Additionally, it has a fake client variant, that does the same thing but with fake clients for use in unit tests.

Aside from this, there are a few conveniences and workarounds built-in to the client to make things simpler.

  // name ([A-Za-z0-9][-A-Za-z0-9_.]*) no more than 63 bytes in length.
  //
  // The key is combined with the resource name of the
  // ValidatingAdmissionPolicy to construct an audit annotation key:
  // "{ValidatingAdmissionPolicy name}/{key}".
  //
  // If an admission webhook uses the same resource name as this ValidatingAdmissionPolicy

)

var (
	PodNamespace      = env.RegisterStringVar("SYSTEM_NAMESPACE", constants.IstioSystemNamespace, "pod's namespace").Get()
	PodName           = env.RegisterStringVar("POD_NAME", "", "").Get()
	NodeName          = env.RegisterStringVar("NODE_NAME", "", "").Get()
	Revision          = env.RegisterStringVar("REVISION", "", "").Get()

  // this list must have at least one matching (by name) volumeMount in one
  // container in the template. A claim in this list takes precedence over
  // any volumes in the template, with the same name.
  // TODO: Define the behavior if a claim already exists with the same name.
  // +optional
  repeated k8s.io.api.core.v1.PersistentVolumeClaim volumeClaimTemplates = 4;

  // serviceName is the name of the service that governs this StatefulSet.

  // +optional
  optional string apiGroup = 1;

  // Kind is the type of resource being referenced. This is the same
  // value as in the parameter object's metadata, for example "ConfigMap".
  optional string kind = 2;

  // Name is the name of resource being referenced.
  optional string name = 3;
}

// ResourceClaimSchedulingStatus contains information about one particular

// AllowedCSIDriver represents a single inline CSI Driver that is allowed to be used.
message AllowedCSIDriver {
  // Name is the registered name of the CSI driver
  optional string name = 1;
}

// AllowedFlexVolume represents a single Flexvolume that is allowed to be used.
message AllowedFlexVolume {
  // driver is the name of the Flexvolume driver.
  optional string driver = 1;
}