Merge pull request #49850 from m1093782566/service-session-timeout

Automatic merge from submit-queue (batch tested with PRs 49850, 47782, 50595, 50730, 51341)

Paramaterize `stickyMaxAgeMinutes` for service in API

**What this PR does / why we need it**:

Currently I find `stickyMaxAgeMinutes` for a session affinity type service is hard code to 180min. There is a TODO comment, see

https://github.com/kubernetes/kubernetes/blob/master/pkg/proxy/iptables/proxier.go#L205

I think the seesion sticky max time varies from service to service and users may not aware of it since it's hard coded in all proxier.go - iptables, userspace and winuserspace.

Once we parameterize it in API, users can set/get the values for their different services.

Perhaps, we can introduce a new field `api.ClientIPAffinityConfig` in `api.ServiceSpec`.

There is an initial discussion about it in sig-network group. See,

https://groups.google.com/forum/#!topic/kubernetes-sig-network/i-LkeHrjs80

**Which issue this PR fixes**: 

fixes #49831

**Special notes for your reviewer**:

**Release note**:

```release-note
Paramaterize session affinity timeout seconds in service API for Client IP based session affinity.
```

pkg/api/v1/zz_generated.conversion.go

@@ -62,6 +62,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_api_CephFSVolumeSource_To_v1_CephFSVolumeSource,
 		Convert_v1_CinderVolumeSource_To_api_CinderVolumeSource,
 		Convert_api_CinderVolumeSource_To_v1_CinderVolumeSource,
+		Convert_v1_ClientIPConfig_To_api_ClientIPConfig,
+		Convert_api_ClientIPConfig_To_v1_ClientIPConfig,
 		Convert_v1_ComponentCondition_To_api_ComponentCondition,
 		Convert_api_ComponentCondition_To_v1_ComponentCondition,
 		Convert_v1_ComponentStatus_To_api_ComponentStatus,
@@ -364,6 +366,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_api_ServiceSpec_To_v1_ServiceSpec,
 		Convert_v1_ServiceStatus_To_api_ServiceStatus,
 		Convert_api_ServiceStatus_To_v1_ServiceStatus,
+		Convert_v1_SessionAffinityConfig_To_api_SessionAffinityConfig,
+		Convert_api_SessionAffinityConfig_To_v1_SessionAffinityConfig,
 		Convert_v1_StorageOSPersistentVolumeSource_To_api_StorageOSPersistentVolumeSource,
 		Convert_api_StorageOSPersistentVolumeSource_To_v1_StorageOSPersistentVolumeSource,
 		Convert_v1_StorageOSVolumeSource_To_api_StorageOSVolumeSource,
@@ -703,6 +707,26 @@ func Convert_api_CinderVolumeSource_To_v1_CinderVolumeSource(in *api.CinderVolum
 	return autoConvert_api_CinderVolumeSource_To_v1_CinderVolumeSource(in, out, s)
 }
 
+func autoConvert_v1_ClientIPConfig_To_api_ClientIPConfig(in *v1.ClientIPConfig, out *api.ClientIPConfig, s conversion.Scope) error {
+	out.TimeoutSeconds = (*int32)(unsafe.Pointer(in.TimeoutSeconds))
+	return nil
+}
+
+// Convert_v1_ClientIPConfig_To_api_ClientIPConfig is an autogenerated conversion function.
+func Convert_v1_ClientIPConfig_To_api_ClientIPConfig(in *v1.ClientIPConfig, out *api.ClientIPConfig, s conversion.Scope) error {
+	return autoConvert_v1_ClientIPConfig_To_api_ClientIPConfig(in, out, s)
+}
+
+func autoConvert_api_ClientIPConfig_To_v1_ClientIPConfig(in *api.ClientIPConfig, out *v1.ClientIPConfig, s conversion.Scope) error {
+	out.TimeoutSeconds = (*int32)(unsafe.Pointer(in.TimeoutSeconds))
+	return nil
+}
+
+// Convert_api_ClientIPConfig_To_v1_ClientIPConfig is an autogenerated conversion function.
+func Convert_api_ClientIPConfig_To_v1_ClientIPConfig(in *api.ClientIPConfig, out *v1.ClientIPConfig, s conversion.Scope) error {
+	return autoConvert_api_ClientIPConfig_To_v1_ClientIPConfig(in, out, s)
+}
+
 func autoConvert_v1_ComponentCondition_To_api_ComponentCondition(in *v1.ComponentCondition, out *api.ComponentCondition, s conversion.Scope) error {
 	out.Type = api.ComponentConditionType(in.Type)
 	out.Status = api.ConditionStatus(in.Status)
@@ -4930,6 +4954,7 @@ func autoConvert_v1_ServiceSpec_To_api_ServiceSpec(in *v1.ServiceSpec, out *api.
 	out.ExternalTrafficPolicy = api.ServiceExternalTrafficPolicyType(in.ExternalTrafficPolicy)
 	out.HealthCheckNodePort = in.HealthCheckNodePort
 	out.PublishNotReadyAddresses = in.PublishNotReadyAddresses
+	out.SessionAffinityConfig = (*api.SessionAffinityConfig)(unsafe.Pointer(in.SessionAffinityConfig))
 	return nil
 }
 
@@ -4947,6 +4972,7 @@ func autoConvert_api_ServiceSpec_To_v1_ServiceSpec(in *api.ServiceSpec, out *v1.
 	out.ExternalIPs = *(*[]string)(unsafe.Pointer(&in.ExternalIPs))
 	out.LoadBalancerIP = in.LoadBalancerIP
 	out.SessionAffinity = v1.ServiceAffinity(in.SessionAffinity)
+	out.SessionAffinityConfig = (*v1.SessionAffinityConfig)(unsafe.Pointer(in.SessionAffinityConfig))
 	out.LoadBalancerSourceRanges = *(*[]string)(unsafe.Pointer(&in.LoadBalancerSourceRanges))
 	out.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyType(in.ExternalTrafficPolicy)
 	out.HealthCheckNodePort = in.HealthCheckNodePort
@@ -4983,6 +5009,26 @@ func Convert_api_ServiceStatus_To_v1_ServiceStatus(in *api.ServiceStatus, out *v
 	return autoConvert_api_ServiceStatus_To_v1_ServiceStatus(in, out, s)
 }
 
+func autoConvert_v1_SessionAffinityConfig_To_api_SessionAffinityConfig(in *v1.SessionAffinityConfig, out *api.SessionAffinityConfig, s conversion.Scope) error {
+	out.ClientIP = (*api.ClientIPConfig)(unsafe.Pointer(in.ClientIP))
+	return nil
+}
+
+// Convert_v1_SessionAffinityConfig_To_api_SessionAffinityConfig is an autogenerated conversion function.
+func Convert_v1_SessionAffinityConfig_To_api_SessionAffinityConfig(in *v1.SessionAffinityConfig, out *api.SessionAffinityConfig, s conversion.Scope) error {
+	return autoConvert_v1_SessionAffinityConfig_To_api_SessionAffinityConfig(in, out, s)
+}
+
+func autoConvert_api_SessionAffinityConfig_To_v1_SessionAffinityConfig(in *api.SessionAffinityConfig, out *v1.SessionAffinityConfig, s conversion.Scope) error {
+	out.ClientIP = (*v1.ClientIPConfig)(unsafe.Pointer(in.ClientIP))
+	return nil
+}
+
+// Convert_api_SessionAffinityConfig_To_v1_SessionAffinityConfig is an autogenerated conversion function.
+func Convert_api_SessionAffinityConfig_To_v1_SessionAffinityConfig(in *api.SessionAffinityConfig, out *v1.SessionAffinityConfig, s conversion.Scope) error {
+	return autoConvert_api_SessionAffinityConfig_To_v1_SessionAffinityConfig(in, out, s)
+}
+
 func autoConvert_v1_StorageOSPersistentVolumeSource_To_api_StorageOSPersistentVolumeSource(in *v1.StorageOSPersistentVolumeSource, out *api.StorageOSPersistentVolumeSource, s conversion.Scope) error {
 	out.VolumeName = in.VolumeName
 	out.VolumeNamespace = in.VolumeNamespace