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+# kstatus
+
+kstatus provides tools for checking the status of Kubernetes resources. The primary use case is knowing when 
+(or if) a given set of resources in cluster has successfully reconciled an apply operation.
+
+## Concepts
+
+This effort has several goals, some with a shorter timeline than others. Initially, we want to provide
+a library that makes it easier to decide when changes to a set of resources have been reconciled in a cluster.
+To support types that do not yet publish status information, we will initially fallback on type specific rules. 
+The library already contains rules for many of the most common built-in types such a Deployment and StatefulSet.
+
+For custom resource definitions (CRDs), there currently isn't much guidance on which properties should be exposed in the status
+object and which conditions should be used. As part of this effort we want to define a set of standard conditions
+that the library will understand and that we encourage developers to adopt in their CRDs. These standard conditions will
+be focused on providing the necessary information for understanding status of the reconcile after `apply` and it is not
+expected that these will necessarily be the only conditions exposed in a custom resource. Developers will be free to add as many conditions
+as they wish, but if the CRDs adopt the standard conditions defined here, this library will handle them correctly.
+
+The `status` objects for built-in types don't all conform to a common behavior. Not all built-in types expose conditions,
+and even among the types that does, the types of conditions vary widely. Long-term, we hope to add support for the
+standard conditions to the built-in types as well. This would remove the need for type-specific rules for determining
+status.
+
+### Statuses
+
+The library currently defines the following statuses for resource:
+* __InProgress__: The actual state of the resource has not yet reached the desired state as specified in the
+resource manifest, i.e. the resource reconcile has not yet completed. Newly created resources will usually 
+start with this status, although some resources like ConfigMaps are Current immediately.
+* __Failed__: The process of reconciling the actual state with the desired state has encountered and error
+or it has made insufficient progress.
+* __Current__: The actual state of the resource matches the desired state. The reconcile process is considered
+complete until there are changes to either the desired or the actual state.
+* __Terminating__: The resource is in the process of being deleted.
+* __Unknown__: This is for situations when the library are unable to determine the status of a resource.
+
+### Conditions
+
+The conditions defined in the library are designed to adhere to the "abnormal-true" pattern, i.e. that 
+conditions are present and with a value of true whenever something unusual happens. So the absence of
+any conditions means everything is normal. Normal in this situation simply means that the latest observed 
+generation of the resource manifest by the controller have been fully reconciled with the actual state. 
+
+* __InProgress__: The controller is currently working on reconciling the latest changes.
+* __Failed__: The controller has encountered an error during the reconcile process or it has made
+insufficient progress (timeout).
+
+The use of the "abnormal-true" pattern has some challenges. If the controller is not running, or for some
+reason not able to update the resource, it will look like it is in a good state when that is not true. The
+solution to this issue is to adopt the pattern used by several of the built-in types where there is an
+`observedGeneration` property on the status object which is set by the controller during the reconcile loop.
+If the `generation` and the `observedGeneration` of a resource does not match, it means there are changes
+that the controller has not yet seen, and therefore not acted upon.
+
+## Features
+
+The library is currently separated into two packages, one that provides the basic functionality, and another that
+builds upon the basics to provide a higher level API.
+
+**sigs.k8s.io/kustomize/kstatus/status**: Provides two basic functions. First, it provides the `Compute` function
+that takes a single resource and computes the status for this resource based on the fields in the status object for
+the resource. Second, it provides the `Augment` function that computes the appropriate standard conditions based on
+the status object and then amends them to the conditions in the resource. Both of these functions currently operate
+on Unstructured types, but this should eventually be changed to rely on the kyaml library. Both of these functions 
+compute the status and conditions solely based on the data in the resource passed in. It does not communicate with
+a cluster to get the latest state of the resources.
+
+**sigs.k8s.io/kustomize/kstatus/wait**: This package builds upon the status package and provides functionality that
+will fetch the latest state from a cluster. It provides the `FetchAndResolve` function that takes list of resource
+identifiers, fetches the latest state for all the resources from the cluster, computes the status for all of them and
+returns the results. `WaitForStatus` accepts a list of resource identifiers and will poll cluster for the status of 
+the resources until all resources have reached the `Current` status.
+
+## Challenges
+
+### Status is not obvious for all resource types
+
+For some types of resources, it is pretty clear what the different statuses mean. For others, it
+is far less obvious. For example, what does it mean that a PodDisruptionBudget is Current? Based on
+the assumptions above it probably should be whenever the controller has observed the resource
+and updated the status object of the PDB with information on allowed disruptions. But currently, a PDB is
+considered Current when the number of healthy replicas meets the threshold given in the PDB. Also, should
+the presence of a PDB influence when a Deployment is considered Current? This would mean that a Deployment
+should be considered Current whenever the number of replicas reach the threshold set by the corresponding
+PDB. This is not currently supported as described below.
+
+### Status is decided based on single resource
+Currently the status of a resource is decided solely based on information from
+the state of that resource. This is an issue for resources that create other resources
+and that doesn't provide sufficient information within their own status object. An example
+is the Service resource that doesn't provide much status information but do generate Endpoint
+resources that could be used to determine status. Similar, the status of a Deployment could be 
+based on its generated ReplicaSets and Pods.
+
+Not having the generated resources also limits the amount of details that can be provided
+when something isn't working as expected.
+
+
+## Future
+
+### Depend on kyaml instead of k8s libraries
+The sigs.k8s.io/kustomize/kstatus/status package currently depends on k8s libraries. This can be 
+challenging if someone wants to vendor the library within their own project. We want to replace
+the dependencies on k8s libraries with kyaml for the status package. The wait package needs to 
+talk to a k8s cluster, so this package will continue to rely on the k8s libraries.
+
+### Use watches instead of polling
+
+We currently poll for updates to resources, but it would be possible to set up
+watches instead. This could also be combined with deciding status based on not only a single
+resource, but also all its generated resources. This would lead to a design that seems similar
+to a controller, so maybe a solution like this could be built on top of controller-runtime. 
+A challenge here is that the rules for each built-in type would need to be expressed in a different
+way that what we currently do.
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