This is a good plan, very simple and clear, and I like the list of system properties at the end. The solution is pretty tailored for the Go toolchain, which is

This is a good plan, very simple and clear, and I like the list of system properties at the end. The solution is pretty tailored for the Go toolchain, which is a good strategy that has worked for them in the past. A more general purpose metrics tool I'm watching closely is Divvi Up https://divviup.org/ https://divviup.org/, a research project by ISRG, the same org that runs LetsEncrypt. The basic idea is to divide up each metric into two parts and publish each part to separate collection servers (one run by you and the other by divviup). Then the servers separately aggregate their half and combine the results, the idea being that each half is useless on it's own but when combined it's still useful. I wouldn't suggest it for this application, but for the majority of typical apps it would be a vast improvement to privacy compared to the status quo.