Removing duplicated documentation (#4132)

docs/agent/downgrade.md

@@ -1,91 +1,3 @@
 # Downgrade back to Agent 5
 
-This guide assumes you upgraded to the Agent v6 using our [upgrade guide][upgrade-guide]
-
-We have been careful to keep the legacy configurations in place to ease the the
-downgrade process should you decide you do not wish to continue trying the beta.
-
-* [Linux](#linux)
-* [Windows](#windows)
-* [MacOS](#macos)
-
-## Linux
-
-#### Debian Flavored Systems
-
-##### Set up apt so it can download through https
-```shell
-sudo apt-get update
-sudo apt-get install apt-transport-https
-```
-
-##### Remove Beta Repo and Ensure the stable repo is present
-```shell
-sudo rm /etc/apt/sources.list.d/datadog-beta.list
-[ ! -f /etc/apt/sources.list.d/datadog.list ] &&  echo 'deb https://apt.datadoghq.com/ stable main' | sudo tee /etc/apt/sources.list.d/datadog.list
-sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 A2923DFF56EDA6E76E55E492D3A80E30382E94DE
-```
-
-##### Update apt and downgrade the agent
-```shell
-sudo apt-get update
-sudo apt-get remove datadog-agent
-sudo apt-get install datadog-agent
-```
-
-#### Red Hat Flavored Systems
-
-##### Remove the Beta Yum repo from your system:
-```shell
-rm /etc/yum.repos.d/datadog-beta.repo
-[ ! -f /etc/yum.repos.d/datadog.repo ] && echo -e '[datadog]\nname = Datadog, Inc.\nbaseurl = https://yum.datadoghq.com/rpm/x86_64/\nenabled=1\ngpgcheck=1\nrepo_gpgcheck=0\npriority=1\ngpgkey=https://yum.datadoghq.com/DATADOG_RPM_KEY.public\n       https://yum.datadoghq.com/DATADOG_RPM_KEY_E09422B3.public' | sudo tee /etc/yum.repos.d/datadog.repo
-```
-
-##### Update your local yum cache and downgrade the agent
-```shell
-sudo yum clean expire-cache metadata
-sudo yum check-update
-sudo yum remove datadog-agent
-sudo yum install datadog-agent
-```
-
-#### Back-sync configurations and AutoDiscovery templates (optional)
-If you have made any changes to your configurations or templates, you might want
-to sync these back for agent 5.
-
-Note: please beware that if you have made any changes to your configurations to
-support new agent6-only options, these will not work anymore with agent5.
-
-#### Back-sync custom checks (optional)
-If you made any changes or added any new custom checks while testing Agent 6 you might want
-to enable them back on Agent 5. Note: you only need to copy back checks you changed.
-```shell
-sudo -u dd-agent -- cp /etc/datadog-agent/checks.d/<check>.py /etc/dd-agent/checks.d/
-```
-
-#### Restart the agent
-```shell
-# Systemd
-sudo systemctl restart datadog-agent
-# Upstart
-sudo /etc/init.d/datadog-agent restart
-```
-
-#### Clean out /etc/datadog-agent (optional)
-```shell
-sudo -u dd-agent -- rm -rf /etc/datadog-agent/
-```
-
-## Windows
-
-Run the agent installer package for the latest 5.x version,  instructions can be found
-[in the Datadog agent integration page](https://app.datadoghq.com/account/settings#agent/windows).
-
-## MacOS
-
-1. Stop the Agent with the systray app, if it's running
-2. Exit the systray app
-3. Uninstall the Datadog Agent application
-4. Install the Agent 5 DMG package using your preferred installation method
-
-[upgrade-guide]: upgrade.md
+Instructions to downgrade your Agent from version 6 to version 5 can be found in the [Datadog public documentation](https://docs.datadoghq.com/agent/faq/agent-downgrade/).