Fundamentally, this component is responsible for the following:

- Sets up redirection with newly-started (or newly-added, previously-started) application pods such that traffic from application pods is forwarded to the local node's ztunnel pod.
- Configures required iptables, sockets, and packet routing miscellanea within the `ztunnel` and application pod network namespaces to make that happen.

This component accomplishes that in the following ways:

  // which corresponds to the IfHealthyBudget policy.
  //
  // IfHealthyBudget policy means that running pods (status.phase="Running"),
  // but not yet healthy can be evicted only if the guarded application is not
  // disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
  // Healthy pods will be subject to the PDB for eviction.
  //

  // If this is not specified, ports are not restricted and must be
  // interpreted in the context of the specific consumer.
  optional int32 port = 3;

  // appProtocol represents the application protocol for this port.
  // This field follows standard Kubernetes label syntax.
  // Un-prefixed names are reserved for IANA standard service names (as per
  // RFC-6335 and https://www.iana.org/assignments/service-names).

  // port represents the port number of the endpoint.
  // If this is not specified, ports are not restricted and must be
  // interpreted in the context of the specific consumer.
  optional int32 port = 3;

  // The application protocol for this port.
  // This is used as a hint for implementations to offer richer behavior for protocols that they understand.
  // This field follows standard Kubernetes label syntax.
  // Valid values are either:

   When we do this, we will want to preserve the original destination Service IP, as the waypoint can do a better job picking a backend pod than we can.

  // +optional
  optional int32 fullyLabeledReplicas = 2;

  // The number of ready replicas for this replication controller.
  // +optional
  optional int32 readyReplicas = 4;

  // The number of available replicas (ready for at least minReadySeconds) for this replication controller.
  // +optional

stable version in place and gradually migrate apps to the new version.

- More flexibility: the new installer allows multiple 'environments', allowing applications to select
a set of control plane settings and components. While the entire mesh respects the same APIs and config,
apps may target different 'environments' which contain different instances and variants of Istio.

  // 128 characters long, and only contain printable characters,
  // as defined by https://golang.org/pkg/unicode/#IsPrint. This
  // field is required for apply requests
  // (application/apply-patch) but optional for non-apply patch
  // types (JsonPatch, MergePatch, StrategicMergePatch).
  // +optional
  optional string fieldManager = 3;

  // fieldValidation instructs the server on how to handle

   policy enforcement and telemetry recording/reporting
   functions.

  > Note: The service mesh is not an overlay network. It
  > simplifies and enhances how microservices in an application talk to each
  > other over the network provided by the underlying platform.

  // which corresponds to the IfHealthyBudget policy.
  //
  // IfHealthyBudget policy means that running pods (status.phase="Running"),
  // but not yet healthy can be evicted only if the guarded application is not
  // disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
  // Healthy pods will be subject to the PDB for eviction.
  //