readinessPeriodSeconds: 15

      # Enables or disables a startup probe.
      # For optimal startup times, changing this should be tied to the readiness probe values.
      #
      # If the probe is enabled, it is recommended to have delay=0s,period=15s,failureThreshold=4.
      # This ensures the pod is marked ready immediately after the startup probe passes (which has a 1s poll interval),

		} else {
			// If oldpod != ready && newpod != ready, but the ambient annotation was added,
			// then assume this event was generated by the CNI plugin labeling the pod on startup,
			// and skip the event.
			//
			// This isn't perfect (someone could manually annotate an unready pod,
			// then install Istio, then the pod goes ready, and we'd miss capture) - but that

- CAP_SYS_ADMIN
- CAP_NET_ADMIN
- CAP_NET_RAW

## Ambient mode details

Fundamentally, this component is responsible for the following:

      readinessPeriodSeconds: 15
      # Enables or disables a startup probe.
      # For optimal startup times, changing this should be tied to the readiness probe values.
      #
      # If the probe is enabled, it is recommended to have delay=0s,period=15s,failureThreshold=4.
      # This ensures the pod is marked ready immediately after the startup probe passes (which has a 1s poll interval),

		return nil, nil, fmt.Errorf("check minimum supported Kubernetes version: %v", err)
	}
	return kubeClient, client, nil
}

// applyOptions contains the startup options for applying the manifest.
type applyOptions struct {
	// Path to the kubeconfig file.
	Kubeconfig string
	// ComponentName of the kubeconfig context to use.
	Context string

A queue is used to give a few properties:
* Ability to serially process updates received from a variety of different sources. This avoids need for other synchronization mechanisms like mutexes.
* Correctness at startup; with the sequencing above, items are only processed once all informers are synced. This means queries will not return stale data at startup.
* Deduping of identical events

# Downloaded from https://github.com/metallb/metallb/raw/v0.13.12/config/manifests/metallb-native.yaml
# With quay.io hub replaced with gcr.io/istio-testing
# And probes tuned to startup faster
apiVersion: v1
kind: Namespace
metadata:
  labels:
    pod-security.kubernetes.io/audit: privileged
    pod-security.kubernetes.io/enforce: privileged
    pod-security.kubernetes.io/warn: privileged
  name: metallb-system
---
apiVersion: apiextensions.k8s.io/v1

  // +optional
  optional string containerID = 8;

  // Started indicates whether the container has finished its postStart lifecycle hook
  // and passed its startup probe.
  // Initialized as false, becomes true after startupProbe is considered
  // successful. Resets to false when the container is restarted, or if kubelet
  // loses state temporarily. In both cases, startup probes will run again.

seconds. readinessInitialDela: 0 # The period between readiness probes. readinessPeriodSecon: 15 # Enables or disables a startup probe. # For optimal startup times, changing this should be tied to the readiness probe values. # # If the probe is enabled, it is recommended to have delay=0s,period=15s,failureThreshold=4. # This ensures the pod is marked ready immediately after the startup probe passes (which has a 1s poll interval), # and doesn't spam the readiness endpoint too much # # If the probe is disabled,...

### Writing controllers

Istio provides a few helper libraries to get started writing a controller. While these libraries help, there are still a lot of subtleties in correctly writing (and testing!) a controller properly.

To get started writing a controller, review the [Example Controller](../../pkg/kube/controllers/example_test.go).

### Controllers overview