Enhancement: support multiple instance annotation for Kubernetes Automatic Service Discovery (#3590)

docs/configs/kubernetes.md

@@ -98,6 +98,8 @@ When the Kubernetes cluster connection has been properly configured, this servic
 
 If you are using multiple instances of homepage, an `instance` annotation can be specified to limit services to a specific instance. If no instance is provided, the service will be visible on all instances.
 
+If you have a single service that needs to be shown on multiple specific instances of homepage (but not on all of them), the service can be annotated by multiple `instance.name` annotations, where `name` can be the names of your specific multiple homepage instances. For example, a service that is annotated with `gethomepage.dev/instance.public: ""` and `gethomepage.dev/instance.internal: ""` will be shown on `public` and `internal` homepage instances.
+
 ### Traefik IngressRoute support
 
 Homepage can also read ingresses defined using the Traefik IngressRoute custom resource definition. Due to the complex nature of Traefik routing rules, it is required for the `gethomepage.dev/href` annotation to be set:

src/utils/config/service-helpers.js

@@ -254,7 +254,8 @@ export async function servicesFromKubernetes() {
           ingress.metadata.annotations &&
           ingress.metadata.annotations[`${ANNOTATION_BASE}/enabled`] === "true" &&
           (!ingress.metadata.annotations[`${ANNOTATION_BASE}/instance`] ||
-            ingress.metadata.annotations[`${ANNOTATION_BASE}/instance`] === instanceName),
+            ingress.metadata.annotations[`${ANNOTATION_BASE}/instance`] === instanceName ||
+            `${ANNOTATION_BASE}/instance.${instanceName}` in ingress.metadata.annotations),
       )
       .map((ingress) => {
         let constructedService = {