For a variation of this technique see this handy privacy-preserving metrics collection golang library that uses DNS: https://github.com/Jigsaw-Code/choir https:

For a variation of this technique see this handy privacy-preserving metrics collection golang library that uses DNS: https://github.com/Jigsaw-Code/choir https://github.com/Jigsaw-Code/choir Currently used by the Jigsaw group at Google to collect metrics from behind censoring ISPs.