diff --git a/api/openapi-spec/swagger.json b/api/openapi-spec/swagger.json
index 90c6474fee..2d90ff4fea 100644
--- a/api/openapi-spec/swagger.json
+++ b/api/openapi-spec/swagger.json
@@ -2039,7 +2039,7 @@
       ],
       "properties": {
         "comparator": {
-          "description": "Comparator compares the event data with a user given value. Can be \"\u003e=\", \"\u003e\", \"=\", \"\u003c\", or \"\u003c=\". Is optional, and if left blank treated as equality \"=\".",
+          "description": "Comparator compares the event data with a user given value. Can be \"\u003e=\", \"\u003e\", \"=\", \"!=\", \"\u003c\", or \"\u003c=\". Is optional, and if left blank treated as equality \"=\".",
           "type": "string"
         },
         "path": {
diff --git a/api/sensor.html b/api/sensor.html
index 2eb4a24ff3..ac392ce2b2 100644
--- a/api/sensor.html
+++ b/api/sensor.html
@@ -519,7 +519,7 @@ <h3 id="argoproj.io/v1alpha1.DataFilter">DataFilter
 </td>
 <td>
 <p>Comparator compares the event data with a user given value.
-Can be &ldquo;&gt;=&rdquo;, &ldquo;&gt;&rdquo;, &ldquo;=&rdquo;, &ldquo;&lt;&rdquo;, or &ldquo;&lt;=&rdquo;.
+Can be &ldquo;&gt;=&rdquo;, &ldquo;&gt;&rdquo;, &ldquo;=&rdquo;, &ldquo;!=&rdquo;, &ldquo;&lt;&rdquo;, or &ldquo;&lt;=&rdquo;.
 Is optional, and if left blank treated as equality &ldquo;=&rdquo;.</p>
 </td>
 </tr>
diff --git a/api/sensor.md b/api/sensor.md
index 771434e9a4..8440236458 100644
--- a/api/sensor.md
+++ b/api/sensor.md
@@ -1023,8 +1023,8 @@ strconv.ParseFloat() Strings are taken as is Nils this value is ignored
 <p>
 
 Comparator compares the event data with a user given value. Can be
-“\>=”, “\>”, “=”, “\<”, or “\<=”. Is optional, and if left blank
-treated as equality “=”.
+“\>=”, “\>”, “=”, “\!=”, “\<”, or “\<=”. Is optional, and if left
+blank treated as equality “=”.
 
 </p>
 
diff --git a/docs/webhook-health-check.md b/docs/webhook-health-check.md
new file mode 100644
index 0000000000..72ef52cdb1
--- /dev/null
+++ b/docs/webhook-health-check.md
@@ -0,0 +1,33 @@
+# Webhook Health Check
+
+![alpha](assets/alpha.svg)
+
+> v1.0 and after
+
+For `webhook` or `webhook` extended event sources such as `github`, `gitlab`,
+`sns`, `slack`, `Storage GRID` and `stripe`, besides the endpint configured in
+the spec, an endpoint `:${port}/health` will be created by default, this is
+useful for LB or Ingress configuration for the event source, where usually a
+health check endpoint is required.
+
+For example, besides `:12000/example1` and `:13000/example2`, the EventSource
+object below also creates 2 extra endpoints, `:12000/health` and
+`:13000/health`. A HTTP GET request to the health endpoint returns a text `OK`
+with HTTP response code `200`.
+
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: EventSource
+metadata:
+  name: webhook
+spec:
+  webhook:
+    example:
+      port: "12000"
+      endpoint: /example1
+      method: POST
+    example-foo:
+      port: "13000"
+      endpoint: /example2
+      method: POST
+```
diff --git a/eventsources/common/webhook/webhook.go b/eventsources/common/webhook/webhook.go
index 0c99eb56a1..c0fc0b3929 100644
--- a/eventsources/common/webhook/webhook.go
+++ b/eventsources/common/webhook/webhook.go
@@ -24,6 +24,7 @@ import (
 	"github.com/gorilla/mux"
 	"go.uber.org/zap"
 
+	"github.com/argoproj/argo-events/common"
 	"github.com/argoproj/argo-events/common/logging"
 	"github.com/argoproj/argo-events/pkg/apis/eventsource/v1alpha1"
 )
@@ -99,14 +100,22 @@ func startServer(router Router, controller *Controller) {
 	handler := controller.ActiveServerHandlers[route.Context.Port]
 
 	routeName := route.Context.Port + route.Context.Endpoint
-
 	r := handler.GetRoute(routeName)
 	if r == nil {
 		r = handler.NewRoute().Name(routeName)
 		r = r.Path(route.Context.Endpoint)
+		r.HandlerFunc(router.HandleRoute)
 	}
 
-	r.HandlerFunc(router.HandleRoute)
+	healthCheckRouteName := route.Context.Port + "/health"
+	healthCheckRoute := handler.GetRoute(healthCheckRouteName)
+	if healthCheckRoute == nil {
+		healthCheckRoute = handler.NewRoute().Name(healthCheckRouteName)
+		healthCheckRoute = healthCheckRoute.Path("/health")
+		healthCheckRoute.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+			common.SendSuccessResponse(writer, "OK")
+		})
+	}
 
 	Lock.Unlock()
 }
diff --git a/pkg/apis/sensor/v1alpha1/generated.proto b/pkg/apis/sensor/v1alpha1/generated.proto
index 42ed0ae29a..ef3bba87fb 100644
--- a/pkg/apis/sensor/v1alpha1/generated.proto
+++ b/pkg/apis/sensor/v1alpha1/generated.proto
@@ -141,7 +141,7 @@ message DataFilter {
   repeated string value = 3;
 
   // Comparator compares the event data with a user given value.
-  // Can be ">=", ">", "=", "<", or "<=".
+  // Can be ">=", ">", "=", "!=", "<", or "<=".
   // Is optional, and if left blank treated as equality "=".
   optional string comparator = 4;
 }
diff --git a/pkg/apis/sensor/v1alpha1/openapi_generated.go b/pkg/apis/sensor/v1alpha1/openapi_generated.go
index be4778c512..fc5db69ddd 100644
--- a/pkg/apis/sensor/v1alpha1/openapi_generated.go
+++ b/pkg/apis/sensor/v1alpha1/openapi_generated.go
@@ -400,7 +400,7 @@ func schema_pkg_apis_sensor_v1alpha1_DataFilter(ref common.ReferenceCallback) co
 					},
 					"comparator": {
 						SchemaProps: spec.SchemaProps{
-							Description: "Comparator compares the event data with a user given value. Can be \">=\", \">\", \"=\", \"<\", or \"<=\". Is optional, and if left blank treated as equality \"=\".",
+							Description: "Comparator compares the event data with a user given value. Can be \">=\", \">\", \"=\", \"!=\", \"<\", or \"<=\". Is optional, and if left blank treated as equality \"=\".",
 							Type:        []string{"string"},
 							Format:      "",
 						},