Repository: kubernetes-sigs/cloud-provider-azure (go)

Issue:
Unable to set Loadbalancer Service Health Probe Port
Reopen from #1499 

When configuring Health Checks for Azure Load Balancer you can specify the path and type, but it is not possible to specify the port of the health probe.

Istio Ingress Gateway and similar services do not expose health checks on their actual endpoints (as it can operate across multiple protocols) but instead expose a general health check on a different status port for the gateway.

In AWS this is easily possible with the service.beta.kubernetes.io/aws-load-balancer-healthcheck-port annotation but it does not seem possible in Azure.

This prevents us from configuring health check probes against Istio which need to be targeting the "Status Ready" port not the actual port of the backend.

## Example

Istio hosted on two ports: Port 80 and Port 443 will not serve any traffic until a Virtual Service is deployed
The health check needs to be a HTTP health check against the status port, let's say that's 15021
The probe protocol and endpoint and everything can be set, but the health check port cannot be.

For the following spec:
```
spec:
  ports:
    - name: http2
      protocol: TCP
      port: 80
      targetPort: 8080
    - name: https
      protocol: TCP
      port: 443
      targetPort: 8443
```

The generated probe needs to look like this:

![image](https://user-images.githubusercontent.com/2106153/163554395-cbe76f4b-fa39-4ea8-862f-c889db695f38.png)


Pull request:
Add support for specifying probe protocol / probe port via annotation per service port
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#### What type of PR is this?

/kind feature

#### What this PR does / why we need it:

This adds `service.beta.kubernetes.io/port_<num>_health-probe_protocol` and `service.beta.kubernetes.io/port_<num>_health-probe_port` annotations for LoadBalancer Services. These allow overriding the health check port or protocol for a given port. This is useful for ports that cannot respond affirmatively to the health checks and expose health information elsewhere.

#### Which issue(s) this PR fixes:

Fixes #1505 

#### Special notes for your reviewer:

This continues https://github.com/kubernetes-sigs/cloud-provider-azure/pull/1508 and attempts to address the open issue with it. I rebased onto upstream master and added commits to de-duplicate checks and correct an apparent error in the original docs (`/` is the default check path, not `/healthz`).

I'm not quite sure I understand the duplication concern raised in https://github.com/kubernetes-sigs/cloud-provider-azure/pull/1508#pullrequestreview-944084110, and it looks like the line indicated is maybe outdated. As I read it, we pass the rule name (for [internal](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/d92742e0ca76326feaae69e175dea1d3a56945b5/pkg/provider/azure_loadbalancer.go#L2193) and [external](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/d92742e0ca76326feaae69e175dea1d3a56945b5/pkg/provider/azure_loadbalancer.go#L2239) LBs) to the check generator, which then just [uses that string as-is](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/d92742e0ca76326feaae69e175dea1d3a56945b5/pkg/provider/azure_loadbalancer.go#L2136) for the probe name.

That name's [generator](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/d92742e0ca76326feaae69e175dea1d3a56945b5/pkg/provider/azure_standard.go#L282-L301) will return something like `SERVICE_UID-??-tcp-443` (the service, subnet, appProtocol, and port--not sure about the second's appearance, but it's optional anyway). That doesn't seem like it can conflict because there will only be one probe per LB rule name, and the the probes are named for the rule they check, not the port they check.

For example, if we have a Service with HTTP appProtocol ports on 8443 and 8009, and want to override the former to use an HTTP check on 8009 instead, the resulting probes would be:

* `ABC-123-http-8443` (an HTTP check on port 8009)
* `ABC-123-http-8009` (an HTTP check on port 8009)

Based on the discussion after, my additional change looks at the generated probes and only keeps those with unique properties, so that the above would only generate one probe. Naming is still a bit iffy, since you'll still get a probe named after only one of the rules, even though it's pulling double-duty. What name scheme would be desirable (changing it requires updating a bunch of tests, so I wanted to confirm before writing it)? I was thinking either `ABC-123-http-8009-8443` (it indicates all ports it checks) or `ABC-123-http-8009-10-5-/`, indicating all of the probe properties. The latter doesn't work great, however, since it needs to account for HTTP paths, which could get quite unwieldy. It could indicate the port and protocol only, but that _would_ result in name conflicts.

#### Does this PR introduce a user-facing change?

```release-note
Added: support for new annotations **service.beta.kubernetes.io/port_<num>_health-probe_protocol** and **service.beta.kubernetes.io/port_<num>_health-probe_port** to allow explicitly setting the health probe protocol individually for each service port. Useful for services like Istio which have health check seperate from the main service port.
```

Patch:
diff --git a/pkg/consts/consts.go b/pkg/consts/consts.go
index ee5340a60..d832b28d4 100644
--- a/pkg/consts/consts.go
+++ b/pkg/consts/consts.go
@@ -432,6 +432,14 @@ const CreatedByTag = "k8s-azure-created-by"
 const (
 	HealthProbeAnnotationPrefixPattern = "service.beta.kubernetes.io/port_%d_health-probe_"
 
+	// HealthProbeParamsProtocol determines the protocol for the health probe params.
+	// It always takes priority over spec.appProtocol or any other specified protocol
+	HealthProbeParamsProtocol HealthProbeParams = "protocol"
+
+	// HealthProbeParamsPort determines the probe port for the health probe params.
+	// It always takes priority over the NodePort of the spec.ports in a Service
+	HealthProbeParamsPort HealthProbeParams = "port"
+
 	// HealthProbeParamsProbeInterval determines the probe interval of the load balancer health probe.
 	// The minimum probe interval is 5 seconds and the default value is 5. The total duration of all intervals cannot exceed 120 seconds.
 	HealthProbeParamsProbeInterval  HealthProbeParams = "interval"
diff --git a/pkg/provider/azure_loadbalancer.go b/pkg/provider/azure_loadbalancer.go
index fde9fe6bc..e9018224d 100644
--- a/pkg/provider/azure_loadbalancer.go
+++ b/pkg/provider/azure_loadbalancer.go
@@ -2065,19 +2065,45 @@ func (az *Cloud) buildHealthProbeRulesForPort(annotations map[string]string, por
 
 	properties := &network.ProbePropertiesFormat{}
 	var err error
-	if port.AppProtocol == nil {
-		if port.AppProtocol, err = consts.GetAttributeValueInSvcAnnotation(annotations, consts.ServiceAnnotationLoadBalancerHealthProbeProtocol); err != nil {
+
+	// order - Specific Override
+	// port_ annotation
+	// global annotation
+
+	// Select Protocol
+	//
+	var protocol *string
+
+	// 1. Look up port-specific override
+	protocol, err = consts.GetHealthProbeConfigOfPortFromK8sSvcAnnotation(annotations, port.Port, consts.HealthProbeParamsProtocol)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse annotation %s: %w", consts.BuildHealthProbeAnnotationKeyForPort(port.Port, consts.HealthProbeParamsProtocol), err)
+	}
+
+	// 2. If not specified, look up from AppProtocol
+	// Note - this order is to remain compatible with previous versions
+	if protocol == nil {
+		protocol = port.AppProtocol
+	}
+
+	// 3. If protocol is still nil, check the global annotation
+	if protocol == nil {
+		protocol, err = consts.GetAttributeValueInSvcAnnotation(annotations, consts.ServiceAnnotationLoadBalancerHealthProbeProtocol)
+		if err != nil {
 			return nil, fmt.Errorf("failed to parse annotation %s: %w", consts.ServiceAnnotationLoadBalancerHealthProbeProtocol, err)
 		}
-		if port.AppProtocol == nil {
-			port.AppProtocol = to.StringPtr(string(network.ProtocolTCP))
-		}
 	}
-	protocol := strings.TrimSpace(*port.AppProtocol)
+
+	// 4. Finally, if protocol is still nil, default to TCP
+	if protocol == nil {
+		protocol = to.StringPtr(string(network.ProtocolTCP))
+	}
+
+	*protocol = strings.TrimSpace(*protocol)
 	switch {
-	case strings.EqualFold(protocol, string(network.ProtocolTCP)):
+	case strings.EqualFold(*protocol, string(network.ProtocolTCP)):
 		properties.Protocol = network.ProbeProtocolTCP
-	case strings.EqualFold(protocol, string(network.ProtocolHTTPS)):
+	case strings.EqualFold(*protocol, string(network.ProtocolHTTPS)):
 		//HTTPS probe is only supported in standard loadbalancer
 		//For backward compatibility,when unsupported protocol is used, fall back to tcp protocol in basic lb mode instead
 		if !az.useStandardLoadBalancer() {
@@ -2085,13 +2111,39 @@ func (az *Cloud) buildHealthProbeRulesForPort(annotations map[string]string, por
 		} else {
 			properties.Protocol = network.ProbeProtocolHTTPS
 		}
-	case strings.EqualFold(protocol, string(network.ProtocolHTTP)):
+	case strings.EqualFold(*protocol, string(network.ProtocolHTTP)):
 		properties.Protocol = network.ProbeProtocolHTTP
 	default:
 		//For backward compatibility,when unsupported protocol is used, fall back to tcp protocol in basic lb mode instead
 		properties.Protocol = network.ProbeProtocolTCP
 	}
 
+	// Lookup or Override Health Probe Port
+	properties.Port = &port.NodePort
+
+	// Look up port-specific override
+	var probePortValidator = func(val *int32) error {
+		//minimum number of unhealthy responses is 2. ref: https://docs.microsoft.com/en-us/rest/api/load-balancer/load-balancers/create-or-update#probe
+		const (
+			MinProbePort = 1
+			MaxProbePort = 65535
+		)
+		if *val < MinProbePort || *val > MaxProbePort {
+			return fmt.Errorf("the value of %s must be between %d and %d inclusive", consts.HealthProbeParamsPort, MinProbePort, MaxProbePort)
+		}
+		return nil
+	}
+
+	probePort, err := consts.GetInt32HealthProbeConfigOfPortFromK8sSvcAnnotation(annotations, port.Port, consts.HealthProbeParamsPort, probePortValidator)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse annotation %s: %w", consts.BuildHealthProbeAnnotationKeyForPort(port.Port, consts.HealthProbeParamsPort), err)
+	}
+
+	if probePort != nil {
+		properties.Port = probePort
+	}
+
+	// Select request path
 	if strings.EqualFold(string(properties.Protocol), string(network.ProtocolHTTPS)) || strings.EqualFold(string(properties.Protocol), string(network.ProtocolHTTP)) {
 		// get request path ,only used with http/https probe
 		path, err := consts.GetHealthProbeConfigOfPortFromK8sSvcAnnotation(annotations, port.Port, consts.HealthProbeParamsRequestPath)
@@ -2165,7 +2217,6 @@ func (az *Cloud) buildHealthProbeRulesForPort(annotations map[string]string, por
 	}
 	properties.IntervalInSeconds = probeInterval
 	properties.NumberOfProbes = numberOfProbes
-	properties.Port = &port.NodePort
 	probe := &network.Probe{
 		Name:                  &lbrule,
 		ProbePropertiesFormat: properties,
@@ -2173,6 +2224,25 @@ func (az *Cloud) buildHealthProbeRulesForPort(annotations map[string]string, por
 	return probe, nil
 }
 
+// probeKey generates a string key containing all functional probe configuration, to allow de-duplication of like probes.
+func probeKey(probe network.Probe) string {
+	var port, interval, number int32
+	var path string
+	if probe.Port != nil {
+		port = *probe.Port
+	}
+	if probe.IntervalInSeconds != nil {
+		interval = *probe.IntervalInSeconds
+	}
+	if probe.NumberOfProbes != nil {
+		number = *probe.NumberOfProbes
+	}
+	if probe.RequestPath != nil {
+		path = *probe.RequestPath
+	}
+	return fmt.Sprintf("%s-%d-%d-%d-%s", probe.Protocol, port, interval, number, path)
+}
+
 // buildLBRules
 // for following sku: basic loadbalancer vs standard load balancer
 // for following scenario: internal vs external
@@ -2184,6 +2254,7 @@ func (az *Cloud) getExpectedLBRules(
 
 	var expectedRules []network.LoadBalancingRule
 	var expectedProbes []network.Probe
+	uniqueProbes := make(map[string]network.Probe)
 
 	// support podPresence health check when External Traffic Policy is local
 	// take precedence over user defined probe configuration
@@ -2204,7 +2275,7 @@ func (az *Cloud) getExpectedLBRules(
 				NumberOfProbes:    to.Int32Ptr(consts.HealthProbeDefaultNumOfProbe),
 			},
 		}
-		expectedProbes = append(expectedProbes, *nodeEndpointHealthprobe)
+		uniqueProbes[probeKey(*nodeEndpointHealthprobe)] = *nodeEndpointHealthprobe
 	}
 
 	// In HA mode, lb forward traffic of all port to backend
@@ -2231,7 +2302,7 @@ func (az *Cloud) getExpectedLBRules(
 					//ignore error because we only need one correct rule
 				}
 				if portprobe != nil {
-					expectedProbes = append(expectedProbes, *portprobe)
+					uniqueProbes[probeKey(*portprobe)] = *portprobe
 					props.Probe = &network.SubResource{
 						ID: to.StringPtr(az.getLoadBalancerProbeID(lbName, az.getLoadBalancerResourceGroup(), *portprobe.Name)),
 					}
@@ -2277,7 +2348,7 @@ func (az *Cloud) getExpectedLBRules(
 					return expectedProbes, expectedRules, err
 				}
 				if portprobe != nil {
-					expectedProbes = append(expectedProbes, *portprobe)
+					uniqueProbes[probeKey(*portprobe)] = *portprobe
 					props.Probe = &network.SubResource{
 						ID: to.StringPtr(az.getLoadBalancerProbeID(lbName, az.getLoadBalancerResourceGroup(), *portprobe.Name)),
 					}
@@ -2299,6 +2370,10 @@ func (az *Cloud) getExpectedLBRules(
 		}
 	}
 
+	for _, probe := range uniqueProbes {
+		expectedProbes = append(expectedProbes, probe)
+	}
+
 	return expectedProbes, expectedRules, nil
 }
 
diff --git a/site/content/en/topics/loadbalancer.md b/site/content/en/topics/loadbalancer.md
index 4f3c28507..51c72ae60 100644
--- a/site/content/en/topics/loadbalancer.md
+++ b/site/content/en/topics/loadbalancer.md
@@ -33,6 +33,8 @@ Below is a list of annotations supported for Kubernetes services with type `Load
 | `service.beta.kubernetes.io/azure-load-balancer-health-probe-interval` | Health probe interval | Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.21 and later  with out-of-tree cloud provider  |
 | `service.beta.kubernetes.io/azure-load-balancer-health-probe-num-of-probe` | The minimum number of unhealthy responses of health probe  |  Refer to the detailed docs [here](#custom-load-balancer-health-probe) |	v1.21 and later  with out-of-tree cloud provider|
 | `service.beta.kubernetes.io/azure-load-balancer-health-probe-request-path` | Request path of the health probe | Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.20 and later  with out-of-tree cloud provider|
+| `service.beta.kubernetes.io/port_{port}_health-probe_protocol` | Health probe protocol | {port} is the port number in the service. Explicit protocol for the health probe for the service port {port}, overriding port.appProtocol if set.  Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.21 and later with out-of-tree cloud provider|
+| `service.beta.kubernetes.io/port_{port}_health-probe_port` | Health probe protocol |  port} is the port number in the service. Explicit port for the health probe for the service port {port}, overriding the default value.  Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.21 and later with out-of-tree cloud provider|
 | `service.beta.kubernetes.io/port_{port}_health-probe_interval` | Health probe interval |  {port} is port number of service.  Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.21 and later  with out-of-tree cloud provider|
 | `service.beta.kubernetes.io/port_{port}_health-probe_num-of-probe` | The minimum number of unhealthy responses of health probe  | {port} is port number of service. Refer to the detailed docs [here](#custom-load-balancer-health-probe) |	v1.21 and later with out-of-tree cloud provider|
 | `service.beta.kubernetes.io/port_{port}_health-probe_request-path` | Request path of the health probe | {port} is port number of service.  Refer to the detailed docs [here](#custom-load-balancer-health-probe) | v1.20 and later with out-of-tree cloud provider|
@@ -189,14 +191,17 @@ Since v1.21, two service annotations `service.beta.kubernetes.io/azure-load-bala
 
 
 ### Custom Load Balancer health probe for port
+Different ports in a service may require different health probe configurations. This could be because of service design (such as a single health endpoint controlling multiple ports), or Kubernetes features like the [MixedProtocolLBService](https://kubernetes.io/docs/concepts/services-networking/service/#load-balancers-with-mixed-protocol-types).
 
-Because [MixedProtocolLBService](https://kubernetes.io/docs/concepts/services-networking/service/#load-balancers-with-mixed-protocol-types) feature is in alpha stage, Ports in one service may have different probe configurations. Following annotations are introduced to customize probe configuration for one port.
+The following annotations can be used to customize probe configuration per service port.
 
-| port specific annotation | global probe annotation |
-| --| -- |
-|service.beta.kubernetes.io/port_{port}_health-probe_request-path|service.beta.kubernetes.io/azure-load-balancer-health-probe-request-path|
-|service.beta.kubernetes.io/port_{port}_health-probe_num-of-probe|service.beta.kubernetes.io/azure-load-balancer-health-probe-num-of-probe|
-|service.beta.kubernetes.io/port_{port}_health-probe_interval    |service.beta.kubernetes.io/azure-load-balancer-health-probe-interval    |
+| port specific annotation | global probe annotation | Usage |
+| --| -- | -- |
+|service.beta.kubernetes.io/port_{port}_health-probe_protocol| N/A (no equivalent globally) | Set the health probe protocol for this service port (e.g. Http, Https, Tcp) |
+|service.beta.kubernetes.io/port_{port}_health-probe_port| N/A (no equivalent globally) | Sets the health probe port for this service port (e.g. 15021) |
+|service.beta.kubernetes.io/port_{port}_health-probe_request-path|service.beta.kubernetes.io/azure-load-balancer-health-probe-request-path| For Http or Https, sets the health probe request path. Defaults to /|
+|service.beta.kubernetes.io/port_{port}_health-probe_num-of-probe|service.beta.kubernetes.io/azure-load-balancer-health-probe-num-of-probe| Number of consecutive probe failures before the port is considered unhealthy|
+|service.beta.kubernetes.io/port_{port}_health-probe_interval    |service.beta.kubernetes.io/azure-load-balancer-health-probe-interval    | The amount of time between probe attempts |
 
 For following manifest, probe rule for port httpsserver is different from the one for httpserver because annoations for port httpsserver are specified.
 
@@ -224,6 +229,38 @@ spec:
       targetPort: 30104
 ```
 
+In this manifest, the https ports use a different health probe endpoint, an HTTP readiness check at port 30000 on /healthz/ready.
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: istio
+  annotations:
+    service.beta.kubernetes.io/azure-load-balancer-internal: "true"
+    service.beta.kubernetes.io/port_443_health-probe_protocol: "http"
+    service.beta.kubernetes.io/port_443_health-probe_port: "30000"
+    service.beta.kubernetes.io/port_443_health-probe_request-path: "/healthz/ready"
+spec:
+  ports:
+    - name: https
+      protocol: TCP
+      port: 443
+      targetPort: 8443
+      appProtocol: https
+  selector:
+    app: istio-ingressgateway
+    gateway: istio-ingressgateway
+    istio: ingressgateway
+  type: LoadBalancer
+  sessionAffinity: None
+  externalTrafficPolicy: Local
+  ipFamilies:
+    - IPv4
+  ipFamilyPolicy: SingleStack
+  allocateLoadBalancerNodePorts: true
+  internalTrafficPolicy: Cluster
+```
+
 ## Configure Load Balancer backend
 
 > This feature is supported since v1.23.0


Test patch:
diff --git a/pkg/provider/azure_loadbalancer_test.go b/pkg/provider/azure_loadbalancer_test.go
index 869975a39..788095fe7 100644
--- a/pkg/provider/azure_loadbalancer_test.go
+++ b/pkg/provider/azure_loadbalancer_test.go
@@ -2288,7 +2288,7 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 			expectedRules:   getDefaultTestRules(true),
 		},
 		{
-			desc: "getExpectedLBRules should return error when deprecated tcp health probe annotations and protocols are added and config is not valid",
+			desc: "getExpectedLBRules should return error when probe interval * num > 120",
 			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsProbeInterval): "10",
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsNumOfProbe):    "20",
@@ -2299,7 +2299,7 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 			expectedErr:     true,
 		},
 		{
-			desc: "getExpectedLBRules should return error when deprecated tcp health probe annotations and protocols are added and config is not valid",
+			desc: "getExpectedLBRules should return error when probe interval * num ==  120",
 			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsProbeInterval): "10",
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsNumOfProbe):    "20",
@@ -2318,18 +2318,18 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 			loadBalancerSku: "standard",
 			probeProtocol:   "Https",
 			probePath:       "/healthy1",
-			expectedProbes:  getTestProbes("Https", "/healthy1", to.Int32Ptr(20), to.Int32Ptr(10080), to.Int32Ptr(5)),
+			expectedProbes:  getTestProbes("Https", "/healthy1", to.Int32Ptr(20), to.Int32Ptr(80), to.Int32Ptr(10080), to.Int32Ptr(5)),
 			expectedRules:   getDefaultTestRules(true),
 		},
 		{
-			desc: "getExpectedLBRules should return correct rule when health probe annotations are added,default path should be /healthy",
+			desc: "getExpectedLBRules should return correct rule when health probe annotations are added,default path should be /",
 			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsProbeInterval): "20",
 				consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsNumOfProbe):    "5",
 			}, false, 80),
 			loadBalancerSku: "standard",
 			probeProtocol:   "Http",
-			expectedProbes:  getTestProbes("Http", "/", to.Int32Ptr(20), to.Int32Ptr(10080), to.Int32Ptr(5)),
+			expectedProbes:  getTestProbes("Http", "/", to.Int32Ptr(20), to.Int32Ptr(80), to.Int32Ptr(10080), to.Int32Ptr(5)),
 			expectedRules:   getDefaultTestRules(true),
 		},
 		{
@@ -2340,7 +2340,7 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 			}, false, 80),
 			loadBalancerSku: "standard",
 			probeProtocol:   "Tcp",
-			expectedProbes:  getTestProbes("Tcp", "", to.Int32Ptr(20), to.Int32Ptr(10080), to.Int32Ptr(5)),
+			expectedProbes:  getTestProbes("Tcp", "", to.Int32Ptr(20), to.Int32Ptr(80), to.Int32Ptr(10080), to.Int32Ptr(5)),
 			expectedRules:   getDefaultTestRules(true),
 		},
 		{
@@ -2392,6 +2392,60 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 			},
 			expectedProbes: getDefaultTestProbes("Tcp", ""),
 		},
+		{
+			desc: "getExpectedLBRules should prioritize port specific probe protocol over defaults",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_80_health-probe_protocol": "HtTp",
+			}, false, 80),
+			expectedRules:  getDefaultTestRules(false),
+			expectedProbes: getDefaultTestProbes("Http", "/"),
+		},
+		{
+			desc: "getExpectedLBRules should prioritize port specific probe protocol over appProtocol",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_80_health-probe_protocol": "HtTp",
+			}, false, 80),
+			probeProtocol:  "Mongodb",
+			expectedRules:  getDefaultTestRules(false),
+			expectedProbes: getDefaultTestProbes("Http", "/"),
+		},
+		{
+			desc: "getExpectedLBRules should prioritize port specific probe protocol over deprecated annotation",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_80_health-probe_protocol":             "HtTpS",
+				"service.beta.kubernetes.io/azure-load-balancer-health-probe-protocol": "TcP",
+			}, false, 80),
+			loadBalancerSku: "standard",
+			probeProtocol:   "Https",
+			expectedRules:   getDefaultTestRules(true),
+			expectedProbes:  getDefaultTestProbes("Https", "/"),
+		},
+		{
+			desc: "getExpectedLBRules should default to Tcp on invalid port specific probe protocol",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_80_health-probe_protocol": "FooBar",
+			}, false, 80),
+			probeProtocol:  "Http",
+			expectedRules:  getDefaultTestRules(false),
+			expectedProbes: getDefaultTestProbes("Tcp", ""),
+		},
+		{
+			desc: "getExpectedLBRules should allow setting port specific health probe port",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_80_health-probe_protocol": "Http",
+				"service.beta.kubernetes.io/port_80_health-probe_port":     "15012",
+			}, false, 80),
+			expectedRules:  getDefaultTestRules(false),
+			expectedProbes: getTestProbes("Http", "/", to.Int32Ptr(5), to.Int32Ptr(80), to.Int32Ptr(15012), to.Int32Ptr(2)),
+		},
+		{
+			desc: "getExpectedLBRules should not include duplicate probes when overrides would create them",
+			service: getTestService("test1", v1.ProtocolTCP, map[string]string{
+				"service.beta.kubernetes.io/port_8000_health-probe_port": "10080",
+			}, false, 80, 8000),
+			expectedRules:  []network.LoadBalancingRule{getTestRule(false, 80), getTestRule(false, 8000)},
+			expectedProbes: getTestProbes("Tcp", "/", to.Int32Ptr(5), to.Int32Ptr(8000), to.Int32Ptr(10080), to.Int32Ptr(2)),
+		},
 	}
 	rules := getDefaultTestRules(true)
 	rules[0].IdleTimeoutInMinutes = to.Int32Ptr(5)
@@ -2413,7 +2467,7 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 		}, false, 80),
 		loadBalancerSku: "standard",
 		probeProtocol:   "Tcp",
-		expectedProbes:  getTestProbes("Tcp", "", to.Int32Ptr(10), to.Int32Ptr(10080), to.Int32Ptr(10)),
+		expectedProbes:  getTestProbes("Tcp", "", to.Int32Ptr(10), to.Int32Ptr(80), to.Int32Ptr(10080), to.Int32Ptr(10)),
 		expectedRules:   rules,
 	})
 	rules1 := []network.LoadBalancingRule{
@@ -2424,14 +2478,19 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 	rules1[0].Probe.ID = to.StringPtr("/subscriptions/subscription/resourceGroups/rg/providers/Microsoft.Network/loadBalancers/lbname/probes/atest1-TCP-34567")
 	rules1[1].Probe.ID = to.StringPtr("/subscriptions/subscription/resourceGroups/rg/providers/Microsoft.Network/loadBalancers/lbname/probes/atest1-TCP-34567")
 	rules1[2].Probe.ID = to.StringPtr("/subscriptions/subscription/resourceGroups/rg/providers/Microsoft.Network/loadBalancers/lbname/probes/atest1-TCP-34567")
+
+	// When the service spec externalTrafficPolicy is Local all of these annotations should be ignored
 	svc := getTestService("test1", v1.ProtocolTCP, map[string]string{
+		consts.ServiceAnnotationLoadBalancerHealthProbeProtocol:                                "tcp",
+		consts.ServiceAnnotationLoadBalancerHealthProbeRequestPath:                             "/broken/global/path",
 		consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsProbeInterval): "10",
+		consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsProtocol):      "https",
+		consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsRequestPath):   "/broken/local/path",
 		consts.BuildHealthProbeAnnotationKeyForPort(80, consts.HealthProbeParamsNumOfProbe):    "10",
 	}, false, 80, 443, 421)
 	svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
 	svc.Spec.HealthCheckNodePort = 34567
-	probes := getTestProbes("Http", "/healthz", to.Int32Ptr(5), to.Int32Ptr(34567), to.Int32Ptr(2))
-	probes[0].Name = to.StringPtr("atest1-TCP-34567")
+	probes := getTestProbes("Http", "/healthz", to.Int32Ptr(5), to.Int32Ptr(34567), to.Int32Ptr(34567), to.Int32Ptr(2))
 	testCases = append(testCases, struct {
 		desc            string
 		service         v1.Service
@@ -2442,7 +2501,7 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 		expectedRules   []network.LoadBalancingRule
 		expectedErr     bool
 	}{
-		desc:            "getExpectedLBRules should expected rules when externaltrafficpolicy is local",
+		desc:            "getExpectedLBRules should expected rules when externalTrafficPolicy is local",
 		service:         svc,
 		loadBalancerSku: "standard",
 		probeProtocol:   "Http",
@@ -2472,18 +2531,19 @@ func TestReconcileLoadBalancerRule(t *testing.T) {
 		}
 	}
 }
-func getTestProbes(protocol, path string, interval, port, numOfProbe *int32) []network.Probe {
+
+func getTestProbes(protocol, path string, interval, servicePort, probePort, numOfProbe *int32) []network.Probe {
 	return []network.Probe{
-		getTestProbe(protocol, path, interval, port, numOfProbe),
+		getTestProbe(protocol, path, interval, servicePort, probePort, numOfProbe),
 	}
 }
 
-func getTestProbe(protocol, path string, interval, port, numOfProbe *int32) network.Probe {
+func getTestProbe(protocol, path string, interval, servicePort, probePort, numOfProbe *int32) network.Probe {
 	expectedProbes := network.Probe{
-		Name: to.StringPtr(fmt.Sprintf("atest1-TCP-%d", *port-10000)),
+		Name: to.StringPtr(fmt.Sprintf("atest1-TCP-%d", *servicePort)),
 		ProbePropertiesFormat: &network.ProbePropertiesFormat{
 			Protocol:          network.ProbeProtocol(protocol),
-			Port:              port,
+			Port:              probePort,
 			IntervalInSeconds: interval,
 			NumberOfProbes:    numOfProbe,
 		},
@@ -2494,7 +2554,7 @@ func getTestProbe(protocol, path string, interval, port, numOfProbe *int32) netw
 	return expectedProbes
 }
 func getDefaultTestProbes(protocol, path string) []network.Probe {
-	return getTestProbes(protocol, path, to.Int32Ptr(5), to.Int32Ptr(10080), to.Int32Ptr(2))
+	return getTestProbes(protocol, path, to.Int32Ptr(5), to.Int32Ptr(80), to.Int32Ptr(10080), to.Int32Ptr(2))
 }
 
 func getDefaultTestRules(enableTCPReset bool) []network.LoadBalancingRule {