Allow to override the cluster headless service port name for Istio support (#820)

This will be needed for an Istio mesh based installation due to this issue with headless services + Istio - https://istio.io/latest/docs/ops/common-problems/network-issues/#503-error-while-accessing-headless-services

Author: josh-thisisbud

operations/helm/charts/alloy/CHANGELOG.md

@@ -10,6 +10,10 @@ internal API changes are not present.
 Unreleased
 ----------
 
+### Bugfixes
+
+- Fix clustering on instances running within Istio mesh by allowing to change the name of the clustering port
+
 0.3.0 (2024-05-14)
 ------------------
 

operations/helm/charts/alloy/README.md

@@ -34,6 +34,7 @@ useful if just using the default DaemonSet isn't sufficient.
 | Key | Type | Default | Description |
 |-----|------|---------|-------------|
 | alloy.clustering.enabled | bool | `false` | Deploy Alloy in a cluster to allow for load distribution. |
+| alloy.clustering.portName | string | `"http"` | Name for the port used for clustering, useful if running inside an Istio Mesh |
 | alloy.configMap.content | string | `""` | Content to assign to the new ConfigMap.  This is passed into `tpl` allowing for templating from values. |
 | alloy.configMap.create | bool | `true` | Create a new ConfigMap for the config file. |
 | alloy.configMap.key | string | `nil` | Key in ConfigMap to get config from. |

operations/helm/charts/alloy/templates/cluster_service.yaml

@@ -19,7 +19,7 @@ spec:
     #
     # This service should only be used for clustering, and not metric
     # collection.
-    - name: http
+    - name: {{ $values.clustering.portName }}
       port: {{ $values.listenPort }}
       targetPort: {{ $values.listenPort }}
       protocol: "TCP"

operations/helm/charts/alloy/values.yaml

@@ -41,6 +41,9 @@ alloy:
     # -- Deploy Alloy in a cluster to allow for load distribution.
     enabled: false
 
+    # -- Name for the port used for clustering, useful if running inside an Istio Mesh
+    portName: http
+
   # -- Minimum stability level of components and behavior to enable. Must be
   # one of "experimental", "public-preview", or "generally-available".
   stabilityLevel: "generally-available"