docs: document Zeebe exporter index replicas in 8.8 to 8.9 Helm upgrade guide

Author: bkenez

docs/self-managed/upgrade/helm/880-to-890.md

@@ -145,6 +145,19 @@ Additionally, `global.secrets.*` (including `autoGenerated`, `name`, `annotation
 | `global.opensearch.clusterName`                      | Removed. No direct equivalent exists in component-specific configuration. Use `orchestration.extraConfiguration` to configure the app directly.                                                                                                                                                                                              |
 | `global.opensearch.prefix`                           | `optimize.database.opensearch.prefix`; no direct equivalent exists in `orchestration`. Use `orchestration.extraConfiguration` to configure the app directly.                                                                                                                                                                                 |
 
+#### Legacy Zeebe exporter index replicas
+
+In 8.8, `orchestration.index.replicas` set the replica count for the legacy Zeebe Elasticsearch/OpenSearch exporter (`zeebe-record-*`) indices. In 8.9, configure that replica count with the new `orchestration.exporters.zeebe.replicas`, which defaults to `orchestration.index.replicas`, so no change is required to keep the previous behavior:
+
+```yaml
+orchestration:
+  exporters:
+    zeebe:
+      replicas: 1
+```
+
+You can also set it directly through `orchestration.extraConfiguration`.
+
 #### Elasticsearch is now disabled by default
 
 The Elasticsearch subchart is no longer enabled by default. If you are using Elasticsearch, you must explicitly enable it in your `values-8.9.yaml`:

versioned_docs/version-8.9/self-managed/upgrade/helm/880-to-890.md

@@ -145,6 +145,19 @@ Additionally, `global.secrets.*` (including `autoGenerated`, `name`, `annotation
 | `global.opensearch.clusterName`                      | Removed. No direct equivalent exists in component-specific configuration. Use `orchestration.extraConfiguration` to configure the app directly.                                                                                                                                                                                              |
 | `global.opensearch.prefix`                           | `optimize.database.opensearch.prefix`; no direct equivalent exists in `orchestration`. Use `orchestration.extraConfiguration` to configure the app directly.                                                                                                                                                                                 |
 
+#### Legacy Zeebe exporter index replicas
+
+In 8.8, `orchestration.index.replicas` set the replica count for the legacy Zeebe Elasticsearch/OpenSearch exporter (`zeebe-record-*`) indices. In 8.9, configure that replica count with the new `orchestration.exporters.zeebe.replicas`, which defaults to `orchestration.index.replicas`, so no change is required to keep the previous behavior:
+
+```yaml
+orchestration:
+  exporters:
+    zeebe:
+      replicas: 1
+```
+
+You can also set it directly through `orchestration.extraConfiguration`.
+
 #### Elasticsearch is now disabled by default
 
 The Elasticsearch subchart is no longer enabled by default. If you are using Elasticsearch, you must explicitly enable it in your `values-8.9.yaml`: