Allow opt-out of telemetry via environment variables and command-line args

[cakrit]

See #7366 (comment) from @titpetric
We need to make it simpler for people to opt-out from telemetry when installing via docker (and obviously document the fact) and add a CLI option to netdata.

Related: #7401

[sneak]

May I recommend https://consoledonottrack.com ?

The suggestion there is to use the env var DO_NOT_TRACK.

[titpetric]

@sneak that's a great suggestion. @cakrit could I get a confirmation here, so I can pre-emptively implement this for titpetric/netdata before you're ready?

[sneak]

With spying on by default, you will still be in violation of the Docker Hub ToS which prohibits nonconsensual spyware, @titpetric.

[cakrit]

That's awesome, yes. Really cool that such a variable exists.

[titpetric]

@sneak there's disagreement here if telemetry is or isn't spyware (only you believe it is, regardless of the arguments), and the exact wording of docker hub TOS is different than yours, and the technical details from end-to-end have already been discussed at length. I'm not going to enter these debates with you anymore since it's pointless.

As long as telemetry is opt-out on netdata, it will remain so on titpetric/netdata as well.

[cakrit]

@prologic let's put this in the next sprint please.