Update designs/cache_options.md

Co-authored-by: Umanga Chapagain <uchapaga@redhat.com>

designs/cache_options.md

@@ -102,6 +102,47 @@ type Options struct {
   // DefaultUnsafeDisableDeepCopy is the default for UnsafeDisableDeepCopy
   // for everything that doesn't specify this.
   DefaultUnsafeDisableDeepCopy *bool
+
+  // DefaultTransform will be used as transform for all object types
+  // unless they have a more specific transform set in ByObject.
+  DefaultTransform toolscache.TransformFunc
+
+  // HTTPClient is the http client to use for the REST client
+  HTTPClient *http.Client
+
+  // Scheme is the scheme to use for mapping objects to GroupVersionKinds
+  Scheme *runtime.Scheme
+
+  // Mapper is the RESTMapper to use for mapping GroupVersionKinds to Resources
+  Mapper meta.RESTMapper
+
+  // SyncPeriod determines the minimum frequency at which watched resources are
+  // reconciled. A lower period will correct entropy more quickly, but reduce
+  // responsiveness to change if there are many watched resources. Change this
+  // value only if you know what you are doing. Defaults to 10 hours if unset.
+  // there will a 10 percent jitter between the SyncPeriod of all controllers
+  // so that all controllers will not send list requests simultaneously.
+  //
+  // This applies to all controllers.
+  //
+  // A period sync happens for two reasons:
+  // 1. To insure against a bug in the controller that causes an object to not
+  // be requeued, when it otherwise should be requeued.
+  // 2. To insure against an unknown bug in controller-runtime, or its dependencies,
+  // that causes an object to not be requeued, when it otherwise should be
+  // requeued, or to be removed from the queue, when it otherwise should not
+  // be removed.
+  //
+  // If you want
+  // 1. to insure against missed watch events, or
+  // 2. to poll services that cannot be watched,
+  // then we recommend that, instead of changing the default period, the
+  // controller requeue, with a constant duration `t`, whenever the controller
+  // is "done" with an object, and would otherwise not requeue it, i.e., we
+  // recommend the `Reconcile` function return `reconcile.Result{RequeueAfter: t}`,
+  // instead of `reconcile.Result{}`.
+  SyncPeriod *time.Duration
+
 }
 ```
 
@@ -135,7 +176,7 @@ Options{
     &corev1.ConfgMap{}: {
       Namespaces: map[string]*cache.CacheSetting{
         "": {},                                    // No selector for all namespaces...
-        "operator" {LabelSelector: labelSelector}, // except for the operator namespace
+        "operator": {LabelSelector: labelSelector}, // except for the operator namespace
       },
     },
   },