## Everything is Optional

Each component in the new installer is optional. Users can install the component defined in the new installer,
use the equivalent component in `istio-system`, configured with the official installer, or use a different
version or implementation.

For example, you may use your own Prometheus and Grafana installs, or you may use a specialized/custom

`gateways.istio-ingressgateway.*`, release name and namespace taken into account, etc). * Utilizes Gateway injection, simplifying upgrades, allowing gateways to run in any namespace, and avoiding repeating config for sidecars and gateways. * Published to official Istio Helm repository. * Single chart for all gateways (Ingress, Egress, East West). #### General concerns For a smooth migration, the resource names and `Deployment.spec.selector` labels must match. If you install with `helm install istio-gateway...

else
  SHA=$(grep "istio.io/api" go.mod | head -n1 | awk '{ print $2 }')
  if [[ ${SHA} == *"-"* && ! ${SHA} =~ -rc.[0-9]$ && ! ${SHA} =~ -beta.[0-9]$ && ! ${SHA} =~ -alpha.[0-9]$ ]]; then
    # not an official release or release candidate, so get the commit sha
    SHA=$(echo "${SHA}" | awk -F '-' '{ print $NF }')
  fi
fi

if [ -z "${SHA}" ]; then

* Utilizes Gateway injection, simplifying upgrades, allowing gateways to run in any namespace, and avoiding repeating config for sidecars and gateways.
* Published to official Istio Helm repository.
* Single chart for all gateways (Ingress, Egress, East West).

#### General concerns

For a smooth migration, the resource names and `Deployment.spec.selector` labels must match.