[opentelemetry-integration] Add documentation regarding the fleet man…

…agement preset (#489)

Fixes ES-299.

otel-integration/k8s-helm/README.md

@@ -742,6 +742,24 @@ helm upgrade --install otel-coralogix-integration coralogix-charts-virtual/otel-
 
 Once the installation is complete, verify that the Kube State Metrics metrics are being scraped and ingested inside Coralogix.
 
+### Connecting to Coralogix fleet management
+
+The integration can be configured to connect to the Coralogix fleet management server through setting the `presets.fleetManagement.enabled` property to `true`. This connection happens through the OpAMP extension of the Collector and the endpoint used is: `https://ingress.<CORALOGIX_DOMAIN>/opamp/v1`. This feature is disabled by default.
+
+> [!CAUTION]
+> Important security consideration when enabling this feature:
+> - Because this extension shares your Collector's configuration with the fleet management server, it's important to ensure that any secret contained in it is using the environment variable expansion syntax.
+> - The default capabilities of the OpAMP extension **do not** include remote configuration or packages.
+> - By default, the extension will pool the server every 2 minutes. Additional network requests might be made between the server and the Collector, depending on the configuration on both sides.
+
+To enable this feature, set the `presets.fleetManagement.enabled` property to `true`. Here is an example `values.yaml`:
+
+```yaml
+presets:
+  fleetManagement:
+    enabled: true
+```
+
 # Troubleshooting
 
 ## Metrics