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Showing content from https://github.com/kubernetes-sigs/controller-runtime/issues/2374 below:

Priority Queue · Issue #2374 · kubernetes-sigs/controller-runtime · GitHub

• [v0.20] Design: 📖 Add a design for a priority queue #3013
• [v0.20] Initial implementation: ✨ Add a priority queue #3014
  • Follow-up: 🐛 Bugfixes for priority queue #3060
• [v0.21] 🌱 Add priority label to PQ depth metric #3156
• Improvements:
  • Handlers should default to LowPriorityWhenUnchanged without a wrapper #3105
  • Controller should retain priority by default #3157
  • WithLowPriorityWhenUnchanged only sets priority for Add #3171
• [v0.?] Enable feature per default
  • Add Priority parameter to reconcile.Result
  • Add Priority parameter to reconcile.Request (TBD, depending on use cases: 📖 Add a design for a priority queue #3013 (comment))

The feature can be enabled by setting the UsePriorityQueue option to true, e.g.:

	ctrlOptions := ctrl.Options{
		Controller: config.Controller{
			UsePriorityQueue: ptr.To[bool](true),
		},
        ...
	}

	mgr, err := ctrl.NewManager(restConfig, ctrlOptions)

While discussing #857 (comment) an idea come up about having something like a priority queue, so we can give resync events a lower priority while assigning to other events a higher priority.

This could help when there are many objects of the same type and at every resync period there is a storm of events being added to the queue.

cc @alvaroaleman @sbueringer

sbueringer, rabbitfang, cbuto, nao99, ebensom and 4 morealvaroaleman, nathanperkins and tsuzu

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