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feat: Add support for annotations in internal services #1620

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24 changes: 24 additions & 0 deletions pages/clustering/high-availability/setup-ha-cluster-k8s.mdx
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Expand Up @@ -326,6 +326,29 @@ In this example, each data instance's external Service gets the shared
hostname. Bolt and management ports are not set per-instance — they come from
`ports.boltPort` and `ports.managementPort`.

{<h4 className="custom-header"> Per-instance internal access annotations </h4>}

Each data instance and coordinator also has an internal ClusterIP Service used
for in-cluster communication. You can set per-instance annotations on these
internal Services using the `internalAccessAnnotations` field on individual
entries in `data[]` or `coordinators[]`. This is useful for integrations or other tooling that consumes annotations on the internal
Services.

```yaml
data:
- id: "0"
internalAccessAnnotations:
mycompany.io/service-mesh: "enabled"
- id: "1"
internalAccessAnnotations:
mycompany.io/service-mesh: "enabled"

coordinators:
- id: "1"
internalAccessAnnotations:
mycompany.io/service-mesh: "enabled"
```

### Node affinity

Memgraph HA deploys multiple pods, and you can control pod placement with
Expand Down Expand Up @@ -1128,6 +1151,7 @@ following parameters:
| Parameter | Description | Default |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------|-----------------------------------------|
| `id` | ID of the instance | `0` for data, `1` for coordinators |
| `internalAccessAnnotations` | Per-instance annotations for the internal ClusterIP Service. | `{}` |
| `externalAccessAnnotations` | Per-instance annotations for the external access Service, merged with global annotations. | `{}` |
| `args` | Per-instance Memgraph CLI flags. Append-only — see the note below for flags the chart manages. | `["--storage-snapshot-on-exit=false"]` for data, `[]` for coordinators |

Expand Down