Refactor scheduler config API

Refactor the kube-scheduler configuration API, command setup, and server
setup according to the guidelines established in #32215 and using the
kube-proxy refactor (#34727) as a model of a well factored component
adhering to said guidelines.

* Config API: clarify meaning and use of algorithm source by replacing
modality derived from bools and string emptiness checks with an explicit
AlgorithmSource type hierarchy.
* Config API: consolidate client connection config with common structs.
* Config API: split and simplify healthz/metrics server configuration.
* Config API: clarify leader election configuration.
* Config API: improve defaulting.
* CLI: deprecate all flags except `--config`.
* CLI: port all flags to new config API.
* CLI: refactor to match kube-proxy Cobra command style.
* Server: refactor away configurator.go to clarify application wiring.
* Server: refactor to more clearly separate wiring/setup from running.

Fixes #52428.

pkg/apis/componentconfig/zz_generated.deepcopy.go

@@ -36,6 +36,10 @@ func init() {
 // Deprecated: deepcopy registration will go away when static deepcopy is fully implemented.
 func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*ClientConnectionConfiguration).DeepCopyInto(out.(*ClientConnectionConfiguration))
+			return nil
+		}, InType: reflect.TypeOf(&ClientConnectionConfiguration{})},
 		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
 			in.(*GroupResource).DeepCopyInto(out.(*GroupResource))
 			return nil
@@ -52,6 +56,10 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 			in.(*KubeSchedulerConfiguration).DeepCopyInto(out.(*KubeSchedulerConfiguration))
 			return nil
 		}, InType: reflect.TypeOf(&KubeSchedulerConfiguration{})},
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*KubeSchedulerLeaderElectionConfiguration).DeepCopyInto(out.(*KubeSchedulerLeaderElectionConfiguration))
+			return nil
+		}, InType: reflect.TypeOf(&KubeSchedulerLeaderElectionConfiguration{})},
 		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
 			in.(*LeaderElectionConfiguration).DeepCopyInto(out.(*LeaderElectionConfiguration))
 			return nil
@@ -64,6 +72,22 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 			in.(*PortRangeVar).DeepCopyInto(out.(*PortRangeVar))
 			return nil
 		}, InType: reflect.TypeOf(&PortRangeVar{})},
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*SchedulerAlgorithmSource).DeepCopyInto(out.(*SchedulerAlgorithmSource))
+			return nil
+		}, InType: reflect.TypeOf(&SchedulerAlgorithmSource{})},
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*SchedulerPolicyConfigMapSource).DeepCopyInto(out.(*SchedulerPolicyConfigMapSource))
+			return nil
+		}, InType: reflect.TypeOf(&SchedulerPolicyConfigMapSource{})},
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*SchedulerPolicyFileSource).DeepCopyInto(out.(*SchedulerPolicyFileSource))
+			return nil
+		}, InType: reflect.TypeOf(&SchedulerPolicyFileSource{})},
+		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
+			in.(*SchedulerPolicySource).DeepCopyInto(out.(*SchedulerPolicySource))
+			return nil
+		}, InType: reflect.TypeOf(&SchedulerPolicySource{})},
 		conversion.GeneratedDeepCopyFunc{Fn: func(in interface{}, out interface{}, c *conversion.Cloner) error {
 			in.(*VolumeConfiguration).DeepCopyInto(out.(*VolumeConfiguration))
 			return nil
@@ -71,6 +95,22 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	)
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ClientConnectionConfiguration) DeepCopyInto(out *ClientConnectionConfiguration) {
+	*out = *in
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ClientConnectionConfiguration.
+func (in *ClientConnectionConfiguration) DeepCopy() *ClientConnectionConfiguration {
+	if in == nil {
+		return nil
+	}
+	out := new(ClientConnectionConfiguration)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *GroupResource) DeepCopyInto(out *GroupResource) {
 	*out = *in
@@ -172,7 +212,9 @@ func (in *KubeControllerManagerConfiguration) DeepCopyObject() runtime.Object {
 func (in *KubeSchedulerConfiguration) DeepCopyInto(out *KubeSchedulerConfiguration) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
+	in.AlgorithmSource.DeepCopyInto(&out.AlgorithmSource)
 	out.LeaderElection = in.LeaderElection
+	out.ClientConnection = in.ClientConnection
 	return
 }
 
@@ -195,6 +237,23 @@ func (in *KubeSchedulerConfiguration) DeepCopyObject() runtime.Object {
 	}
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *KubeSchedulerLeaderElectionConfiguration) DeepCopyInto(out *KubeSchedulerLeaderElectionConfiguration) {
+	*out = *in
+	out.LeaderElectionConfiguration = in.LeaderElectionConfiguration
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new KubeSchedulerLeaderElectionConfiguration.
+func (in *KubeSchedulerLeaderElectionConfiguration) DeepCopy() *KubeSchedulerLeaderElectionConfiguration {
+	if in == nil {
+		return nil
+	}
+	out := new(KubeSchedulerLeaderElectionConfiguration)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *LeaderElectionConfiguration) DeepCopyInto(out *LeaderElectionConfiguration) {
 	*out = *in
@@ -255,6 +314,106 @@ func (in *PortRangeVar) DeepCopy() *PortRangeVar {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SchedulerAlgorithmSource) DeepCopyInto(out *SchedulerAlgorithmSource) {
+	*out = *in
+	if in.Policy != nil {
+		in, out := &in.Policy, &out.Policy
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(SchedulerPolicySource)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	if in.Provider != nil {
+		in, out := &in.Provider, &out.Provider
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(string)
+			**out = **in
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SchedulerAlgorithmSource.
+func (in *SchedulerAlgorithmSource) DeepCopy() *SchedulerAlgorithmSource {
+	if in == nil {
+		return nil
+	}
+	out := new(SchedulerAlgorithmSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SchedulerPolicyConfigMapSource) DeepCopyInto(out *SchedulerPolicyConfigMapSource) {
+	*out = *in
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SchedulerPolicyConfigMapSource.
+func (in *SchedulerPolicyConfigMapSource) DeepCopy() *SchedulerPolicyConfigMapSource {
+	if in == nil {
+		return nil
+	}
+	out := new(SchedulerPolicyConfigMapSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SchedulerPolicyFileSource) DeepCopyInto(out *SchedulerPolicyFileSource) {
+	*out = *in
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SchedulerPolicyFileSource.
+func (in *SchedulerPolicyFileSource) DeepCopy() *SchedulerPolicyFileSource {
+	if in == nil {
+		return nil
+	}
+	out := new(SchedulerPolicyFileSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *SchedulerPolicySource) DeepCopyInto(out *SchedulerPolicySource) {
+	*out = *in
+	if in.File != nil {
+		in, out := &in.File, &out.File
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(SchedulerPolicyFileSource)
+			**out = **in
+		}
+	}
+	if in.ConfigMap != nil {
+		in, out := &in.ConfigMap, &out.ConfigMap
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(SchedulerPolicyConfigMapSource)
+			**out = **in
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new SchedulerPolicySource.
+func (in *SchedulerPolicySource) DeepCopy() *SchedulerPolicySource {
+	if in == nil {
+		return nil
+	}
+	out := new(SchedulerPolicySource)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *VolumeConfiguration) DeepCopyInto(out *VolumeConfiguration) {
 	*out = *in