Enhancement: support for Kubernetes gateway API (#4643)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>
Co-authored-by: lyons <gittea.sand@gmail.com>
Co-authored-by: Brett Dudo <brett@dudo.io>

docs/configs/kubernetes.md

@@ -8,6 +8,7 @@ The Kubernetes connectivity has the following requirements:
 - Kubernetes 1.19+
 - Metrics Service
 - An Ingress controller
+  - Optionally: Gateway-API
 
 The Kubernetes connection is configured in the `kubernetes.yaml` file. There are 3 modes to choose from:
 
@@ -19,6 +20,22 @@ The Kubernetes connection is configured in the `kubernetes.yaml` file. There are
 mode: default
 ```
 
+To configure Kubernetes gateway-api, ingress or ingressRoute service discovery, add one or multiple of the following settings.
+
+Example settings:
+
+```yaml
+ingress: true # enable ingress only
+```
+
+or
+
+```yaml
+ingress: true # enable ingress
+traefik: true # enable traefik ingressRoute
+gateway: true # enable gateway-api
+```
+
 ## Services
 
 Once the Kubernetes connection is configured, individual services can be configured to pull statistics. Only CPU and Memory are currently supported.
@@ -142,6 +159,10 @@ spec:
 
 If the `href` attribute is not present, Homepage will ignore the specific IngressRoute.
 
+### Gateway API HttpRoute support
+
+Homepage also features automatic service discovery for Gateway API. Service definitions are read by annotating the HttpRoute custom resource definition and are indentical to the Ingress example as defined in [Automatic Service Discovery](#automatic-service-discovery).
+
 ## Caveats
 
 Similarly to Docker service discovery, there currently is no rigid ordering to discovered services and discovered services will be displayed above those specified in the `services.yaml`.

docs/installation/k8s.md

@@ -216,6 +216,14 @@ rules:
     verbs:
       - get
       - list
+  - apiGroups:
+      - gateway.networking.k8s.io
+    resources:
+      - httproutes
+      - gateways
+    verbs:
+      - get
+      - list
   - apiGroups:
       - metrics.k8s.io
     resources: