Documentation on what Telemetry Data is collected + how to opt-in/opt…

…-out (#5253)

docs/content/overview/product-telemetry.md

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+---
+title: "Product Telemetry"
+description: "Learn why NGINX Ingress Controller collects telemetry, and understand how and what it gathers."
+weight: 500
+toc: true
+---
+
+## Overview
+
+NGINX Ingress Controller collects product telemetry data to allow its developers to understand how it's deployed and configured by users.
+This data is used to triage development work, prioritizing features and functionality that will benefit the most people.
+
+
+Product telemetry is enabled by default, collected once every 24 hours. It's then sent to a service managed by F5 over HTTPS.
+
+{{< note >}}
+If you would prefer to avoid sending any telemetry data, you can [opt-out](#opt-out) when installing NGINX Ingress Controller.
+{{< /note >}}
+
+## Data Collected
+
+These are the data points collected and reported by NGINX Ingress Controller:
+- **Project Name** The name of the software, which will be labelled `NIC`.
+- **Project Version** The NGINX Ingress Controller version.
+- **Project Version** The NGINX Ingress Controller version.
+- **Installation ID** Used to identify a unique installation of NGINX Ingress Controller.
+- **VirtualServers** The number of VirtualServer resources managed by NGINX Ingress Controller.
+- **VirtualServerRoutes** The number of VirtualServerRoute resources managed by NGINX Ingress Controller.
+- **TransportServers** The number of TransportServer resources managed by the NGINX Ingress Controller.
+
+## Opt out
+
+Product telemetry can be disabled when installing NGINX Ingress Controller.
+
+### Helm
+
+
+When installing or upgrading NGINX Ingress Controller with Helm, set the `controller.telemetry.enable` option to `false`
+This can be set directly in the `values.yaml` file, or using the `--set` option
+
+```shell
+helm upgrade --install ... --set controller.telemetry.enable=false
+```
+
+### Manifests
+
+When installing NGINX Ingress Controller with Manifests, set the `-enable-telemetry-reporting` flag to `false`