Indicate in all installers before the Enter/yes-no: "Anonymous statistics will be [enabled/disabled]", according to the provided option. Provide information on the option relevant to the specific installer, to opt-out:

• netdata-installer.sh
• kickstart.sh
• kickstart-static64.sh
• binary packages (not sure about this one)

For docker images:

• Add a DO_NOT_TRACK env var which when set will disable the anonymous stat pings.
• Document the env var

Related: #7404 (comment)