Add a status option to the service health check

docs/content/routing/providers/consul-catalog.md

@@ -193,6 +193,14 @@ you'd add the tag `traefik.http.services.{name-of-your-choice}.loadbalancer.pass
     traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+    
+    See [health check](../services/index.md#health-check) for more information.
+    
+    ```yaml
+    traefik.http.services.myservice.loadbalancer.healthcheck.status=42
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
     
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/docker.md

@@ -347,6 +347,14 @@ you'd add the label `traefik.http.services.<name-of-your-choice>.loadbalancer.pa
     - "traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar"
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+
+    See [health check](../services/index.md#health-check) for more information.
+
+    ```yaml
+    - "traefik.http.services.myservice.loadbalancer.healthcheck.status=42"
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
 
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/ecs.md

@@ -195,6 +195,14 @@ you'd add the label `traefik.http.services.{name-of-your-choice}.loadbalancer.pa
     traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+    
+    See [health check](../services/index.md#health-check) for more information.
+    
+    ```yaml
+    traefik.http.services.myservice.loadbalancer.healthcheck.status=42
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
     
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/kv.md

@@ -172,6 +172,14 @@ A Story of key & values
     |-------------------------------------------------------------------|----------|
     | `traefik/http/services/myservice/loadbalancer/healthcheck/method` | `foobar` |
 
+??? info "`traefik/http/services/<service_name>/loadbalancer/healthcheck/status`"
+
+    See [health check](../services/index.md#health-check) for more information.
+
+    | Key (Path)                                                        | Value |
+    |-------------------------------------------------------------------|-------|
+    | `traefik/http/services/myservice/loadbalancer/healthcheck/status` | `42`  |
+
 ??? info "`traefik/http/services/<service_name>/loadbalancer/healthcheck/port`"
 
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/marathon.md

@@ -222,6 +222,14 @@ For example, to change the passHostHeader behavior, you'd add the label `"traefi
     "traefik.http.services.myservice.loadbalancer.healthcheck.method": "foobar"
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+    
+    See [health check](../services/index.md#health-check) for more information.
+    
+    ```json
+    "traefik.http.services.myservice.loadbalancer.healthcheck.status": "42"
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
     
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/nomad.md

@@ -185,6 +185,14 @@ you'd add the tag `traefik.http.services.{name-of-your-choice}.loadbalancer.pass
     traefik.http.services.myservice.loadbalancer.healthcheck.path=/foo
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+
+    See [health check](../services/index.md#health-check) for more information.
+
+    ```yaml
+    traefik.http.services.myservice.loadbalancer.healthcheck.status=42
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
 
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/providers/rancher.md

@@ -228,6 +228,14 @@ you'd add the label `traefik.http.services.{name-of-your-choice}.loadbalancer.pa
     - "traefik.http.services.myservice.loadbalancer.healthcheck.method=foobar"
     ```
 
+??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.status`"
+    
+    See [health check](../services/index.md#health-check) for more information.
+    
+    ```yaml
+    - "traefik.http.services.myservice.loadbalancer.healthcheck.status=42"
+    ```
+
 ??? info "`traefik.http.services.<service_name>.loadbalancer.healthcheck.port`"
     
     See [health check](../services/index.md#health-check) for more information.

docs/content/routing/services/index.md

@@ -316,7 +316,7 @@ On subsequent requests, to keep the session alive with the same server, the clie
 #### Health Check
 
 Configure health check to remove unhealthy servers from the load balancing rotation.
-Traefik will consider your HTTP(s) servers healthy as long as they return status codes between `2XX` and `3XX` to the health check requests (carried out every `interval`).
+Traefik will consider HTTP(s) servers healthy as long as they return a status code to the health check request (carried out every `interval`) between `2XX` and `3XX`, or matching the configured status.
 For gRPC servers, Traefik will consider them healthy as long as they return `SERVING` to [gRPC health check v1](https://github.com/grpc/grpc/blob/master/doc/health-checking.md) requests.
 
 To propagate status changes (e.g. all servers of this service are down) upwards, HealthCheck must also be enabled on the parent(s) of this service.
@@ -333,6 +333,7 @@ Below are the available options for the health check mechanism:
 - `headers` (optional), defines custom headers to be sent to the health check endpoint.
 - `followRedirects` (default: true), defines whether redirects should be followed during the health check calls.
 - `method` (default: GET), defines the HTTP method that will be used while connecting to the endpoint.
+- `status` (optional), defines the expected HTTP status code of the response to the health check request.
 
 !!! info "Interval & Timeout Format"