Adding the support for Unhealthy.draining state (#3548)

Author: shraddhabang

go.mod

@@ -3,7 +3,7 @@ module sigs.k8s.io/aws-load-balancer-controller
 go 1.21
 
 require (
-	github.com/aws/aws-sdk-go v1.48.10
+	github.com/aws/aws-sdk-go v1.50.8
 	github.com/evanphx/json-patch v5.6.0+incompatible
 	github.com/gavv/httpexpect/v2 v2.9.0
 	github.com/go-logr/logr v1.2.4

go.sum

@@ -81,6 +81,8 @@ github.com/aws/aws-sdk-go v1.47.13 h1:pJgCtldg5azDAFoEcE0fz6n+FnCc1/FY4krtUa5uvZ
 github.com/aws/aws-sdk-go v1.47.13/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
 github.com/aws/aws-sdk-go v1.48.10 h1:0LIFG3wp2Dt6PsxKWCg1Y1xRrn2vZnW5/gWdgaBalKg=
 github.com/aws/aws-sdk-go v1.48.10/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
+github.com/aws/aws-sdk-go v1.50.8 h1:gY0WoOW+/Wz6XmYSgDH9ge3wnAevYDSQWPxxJvqAkP4=
+github.com/aws/aws-sdk-go v1.50.8/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=

pkg/targetgroupbinding/targets_manager_types.go

@@ -38,7 +38,8 @@ func (t *TargetInfo) IsDraining() bool {
 	if t.TargetHealth == nil {
 		return false
 	}
-	return awssdk.StringValue(t.TargetHealth.State) == elbv2sdk.TargetHealthStateEnumDraining
+	return awssdk.StringValue(t.TargetHealth.State) == elbv2sdk.TargetHealthStateEnumDraining ||
+		awssdk.StringValue(t.TargetHealth.State) == elbv2sdk.TargetHealthStateEnumUnhealthyDraining
 }
 
 // IsInitial returns whether target is in initial state.