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doc/next: add release notes for telemetry and the godebug directive
For #65614 Change-Id: I6274bdaba970cfb085af500fdaf8ed078202bfdc Reviewed-on: https://go-review.googlesource.com/c/go/+/591380 Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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@ -1,5 +1,31 @@
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## Tools {#tools}
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### Telemetry
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<!-- go.dev/issue/58894, go.dev/issue/67111 -->
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Starting in Go 1.23, the Go toolchain can collect usage and breakage
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statistics that help the Go team understand how the Go toolchain is
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used and how well it is working. We refer to these statistics as
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[Go telemetry](/doc/telemetry).
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Go telemetry is an _opt-in system_, controlled by the
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[`go` `telemetry` command](/cmd/go/#hdr-Manage_telemetry_data_and_settings).
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By default, the toolchain programs
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collect statistics in counter files that can be inspected locally
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but are otherwise unused (`go` `telemetry` `local`).
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To help us keep Go working well and understand Go usage,
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please consider opting in to Go telemetry by running
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`go` `telemetry` `on`.
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In that mode,
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anonymous counter reports are uploaded to
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[telemetry.go.dev](https://telemetry.go.dev) weekly,
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where they are aggregated into graphs and also made
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available for download by any Go contributors or users
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wanting to analyze the data.
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See “[Go Telemetry](/doc/telemetry)” for more details
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about the Go Telemetry system.
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### Go command {#go-command}
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Setting the `GOROOT_FINAL` environment variable no longer has an effect
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@ -23,18 +49,9 @@ It exits with a non-zero code if updates are needed.
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The `go` `list` `-m` `-json` command now includes new `Sum` and `GoModSum` fields.
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This is similar to the existing behavior of the `go` `mod` `download` `-json` command.
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<!-- go.dev/issue/67111 ("cmd/go: add go telemetry subcommand") -->
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The new `go` `telemetry` command can be used to view and configure the telemetry collection
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mode. Without arguments, it displays the current mode. With `local`, `on`, or `off`, it sets
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the collection mode. `go` `env` now lists two values: the `GOTELEMETRY` value, which
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contains the telemetry collection mode, and the `GOTELEMETRYDIR` value setting which contains
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the directory telemetry data and configuration are written to.
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<!-- go.dev/issue/58894 ("all: add opt-in transparent telemetry to Go toolchain") -->
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<!-- TODO: document Go 1.23 behavior (from https://go.dev/cl/559199, https://go.dev/cl/559519, https://go.dev/cl/559795, https://go.dev/cl/562715, https://go.dev/cl/562735, https://go.dev/cl/564555, https://go.dev/cl/570679, https://go.dev/cl/570736, https://go.dev/cl/582695, https://go.dev/cl/584276, https://go.dev/cl/585235, https://go.dev/cl/586138) -->
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<!-- go.dev/issue/65573 ("cmd/go: separate default GODEBUGs from go language version") -->
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<!-- TODO: document Go 1.23 behavior (from https://go.dev/cl/584218, https://go.dev/cl/584300, https://go.dev/cl/584475, https://go.dev/cl/584476) -->
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The new `godebug` directive in `go.mod` and `go.work` declares a
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[GODEBUG setting](/doc/godebug) to apply for the work module or workspace in use.
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### Vet {#vet}
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@ -44,7 +61,7 @@ The `go vet` subcommand now includes the
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analyzer, which flags references to symbols that are too new for the version
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of Go in effect in the referring file. (The effective version is determined
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by the `go` directive in the file's enclosing `go.mod` file, and
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by any [`//go:build` constraints](https://pkg.go.dev/cmd/go#hdr-Build_constraints)
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by any [`//go:build` constraints](/cmd/go#hdr-Build_constraints)
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in the file.)
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For example, it will report a diagnostic for a reference to the
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