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+# Installation
+
+You can install Apicurio Registry Operator using:
+
+* [OperatorHub](https://operatorhub.io/operator/apicurio-registry) (also available on OpenShift)
+* Install file from the distribution archive that is attached to the corresponding GitHub release. Follow the instructions in the included README file.
+* Install file from the [Apicurio Registry Operator repository](https://github.com/Apicurio/apicurio-registry-operator/tree/main/install).
+
+# Features
+
+* Deployed Apicurio Registry version is `2.5.9.Final`.
+
+* The `JAVA_OPTIONS` environment variable no longer works as expected. You can use the `JAVA_OPTS_APPEND` environment variable instead. The `JAVA_OPTS` environment variable is also available, which replaces the default content of Java options. However, it is best to append using the `JAVA_OPTS_APPEND` environment variable if possible. Apicurio Registry Operator has been updated to use the new environment variables.
+
+* Apicurio Registry Operator supports configuration of the SQL data source using environment variables, as an alternative to the `spec.configuration.sql.dataSource` fields in the `ApicurioRegistry` custom resource. This allows users to provide SQL credentials using Kubernetes secrets instead of in plaintext.
+
+  Apicurio Registry Operator has been improved in this version to better support this use case. Users are now able to use both the `spec.configuration.sql.dataSource` and `spec.configuration.env` fields to define parts of the configuration. For example, this  is now valid:
+
+  ```yaml
+  apiVersion: registry.apicur.io/v1
+  kind: ApicurioRegistry
+  metadata:
+    name: myregistry
+  spec:
+    configuration:
+    persistence: sql
+    sql:
+      dataSource:
+        url: "jdbc:postgresql://..."
+        userName: "postgres-user"  
+    env:
+      - name: REGISTRY_DATASOURCE_PASSWORD
+        valueFrom:
+        secretKeyRef:
+          name: postgres-secret
+          key: password
+  ```
+
+  Apicurio Registry Operator detects this type of configuration and applies it immediately without a need for additional user intervention.
+
+* Updated version of `go` to `1.20`.
+
+* Updated dependency versions.
+
+This list may not be exhaustive. For more details, review the documentation included in the distribution archive or at [Apicurio Registry documentation page](https://www.apicur.io/registry/docs/) (select the appropriate Apicurio Registry Operator version in the lower left corner).