Description for setting custom format for access_log or turning it OFF (#1394)

Guide how to turn data plane access_log OFF and how to configure custom log_format for access logs

Author: tataruty

content/ngf/how-to/data-plane-configuration.md

@@ -272,6 +272,44 @@ of a few arguments. {{< /call-out >}}
 
 ---
 
+## Configure the data plane log format
+
+NGINX records client requests immediately after each request is processed. You can use the `NginxProxy` resource to dynamically configure the access log format.
+
+The following command creates a basic `NginxProxy` that defines a custom log format `$remote_addr - [$time_local] "$request" $status $body_bytes_sent`:
+
+```yaml
+kubectl apply -f - <<EOF
+apiVersion: gateway.nginx.org/v1alpha2
+kind: NginxProxy
+metadata:
+  name: ngf-proxy-config
+spec:
+  logging:
+    accessLog:
+      format: $remote_addr - [$time_local] "$request" $status $body_bytes_sent
+EOF
+```
+
+You can disable access logging entirely with the following configuration:
+
+```yaml
+kubectl apply -f - <<EOF
+apiVersion: gateway.nginx.org/v1alpha2
+kind: NginxProxy
+metadata:
+  name: ngf-proxy-config
+spec:
+  logging:
+    accessLog:
+      disable: true
+EOF
+```
+
+{{< call-out "note" >}} File destinations in `logging.accessLog` are not currently supported it is always set to `/dev/stdout`. {{< /call-out >}}
+
+---
+
 ### Run NGINX Gateway Fabric with NGINX in debug mode
 
 To run NGINX Gateway Fabric with NGINX in debug mode, during [installation]({{< ref "/ngf/install/" >}}), follow these additional steps: