x/telemetry/config: initial cmd/go and cmd/compile counters

[matloob]

Summary

We propose to add counters for cmd/go and cmd/compile invocations (that would be the "denominatior" when trying to determine percentage usage), and for cmd/compile stacks when there's a fatal error, and for the Go command's buildmode flag.

Proposed Config Change

https://golang.org/cl/584015

[findleyr]

This LGTM, pending resolution of certain technical details that don't affect the overall proposal (the 'version' string is likely meaningless for programs in cmd).

[gopherbot]

Change https://go.dev/cl/585198 mentions this issue: internal/configgen: don't try to list versions for std programs

[findleyr]

This does indeed require additional support in x/telemetry. I believe https://go.dev/cl/585198 should allow this CL to work, at which point you should probably also add a minimum version to each counter, by adding version: go1.23rc1 as to each chartconfig record in config.txt. Then, the generated upload configuration will not contain so many irrelevant versions for these counters.

[gopherbot]

Change https://go.dev/cl/585376 mentions this issue: internal/chartconfig: add missing newlines between buckets

[findleyr]

This is now done.