Update getting-started.md

Signed-off-by: Yun-Tang Hsu <[email protected]>

docs/getting-started.md

@@ -5,6 +5,8 @@
 <!-- toc -->
 - [Overview](#overview)
 - [Prerequisites](#prerequisites)
+  - [Configuration](#configuration)
+    - [Configuration pre Antrea v1.13](#configuration-pre-antrea-v113)
 - [Theia Installation](#theia-installation)
 - [Features](#features)
   - [Network Flow Visualization and Monitoring](#network-flow-visualization-and-monitoring)
@@ -31,15 +33,23 @@ Theia.
 Theia requires that Antrea v1.7.0 or later is installed in the Kubernetes
 cluster.
 
-For Antrea v1.7, please ensure the Flow Exporter feature of Antrea
-Agent is enabled in the Antrea deployment manifest:
+### Configuration
+
+In addition to enabling the Flow Exporter feature gate, you need to ensure
+that the `flowExporter.enable` flag is set to true in the Antrea Agent
+configuration.
+
+your `antrea-agent` ConfigMap should look like this:
 
 ```yaml
   antrea-agent.conf: |
     ...
     featureGates:
       ...
       FlowExporter: true
+    flowExporter:
+      ...
+      enable: true
 ```
 
 From Antrea v1.8, you can deploy Antrea through Helm by running the following
@@ -50,13 +60,29 @@ helm repo add antrea https://charts.antrea.io
 helm install antrea antrea/antrea -n kube-system --set featureGates.FlowExporter=true
 ```
 
+Ensure `flowExporter.enable` flag is set to true when the version of Antrea is later v1.13.
+
+```bash
+helm repo add antrea https://charts.antrea.io
+helm install antrea antrea/antrea -n kube-system --set featureGates.FlowExporter=true --set flowExporter.enable=true
+```
+
 This will install the latest available version of Antrea with the Flow Exporter
 feature enabled. You can also install a specific version of Antrea (>= v1.8.0)
 with `--version <TAG>`.
 
 For more information about Antrea Helm chart, please refer to
 [Antrea Helm chart installation instructions](https://github.com/antrea-io/antrea/blob/main/docs/helm.md).
 
+#### Configuration pre Antrea v1.13
+
+Prior to the Antrea v1.13 release, the `flowExporter` option group in the
+Antrea Agent configuration did not exist. To enable the Flow Exporter feature,
+one simply needed to enable the feature gate, and the Flow Exporter related
+configuration could be configured using the (now deprecated) `flowCollectorAddr`,
+`flowPollInterval`, `activeFlowExportTimeout`, `idleFlowExportTimeout`
+parameters.
+
 ## Theia Installation
 
 Please install Flow Aggregator and Theia through Helm.