internal/chartconfig: add go/platform/target/port:*-* counter

The accepted GOOS and GOARCH values come from the 49 ports that
includes 2 broken ports (they may still be attempted to be used)
as reported by 'go tool dist list -broken' at tip, Go 1.27 to be.

For golang/go#79214.

Change-Id: Ic5373dcbce04c300415b0a7b51905d6a2f3001dc
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/776000
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/internal/chartconfig/config.txt b/internal/chartconfig/config.txt
index 9717bf3..bea0a14 100644
--- a/internal/chartconfig/config.txt
+++ b/internal/chartconfig/config.txt
@@ -359,3 +359,61 @@
 issue: https://go.dev/issue/76801
 program: cmd/go
 version: go1.27
+---
+title: Target Go port usage
+counter: go/platform/target/port:{
+	aix-ppc64,
+	android-386,
+	android-amd64,
+	android-arm,
+	android-arm64,
+	darwin-amd64,
+	darwin-arm64,
+	dragonfly-amd64,
+	freebsd-386,
+	freebsd-amd64,
+	freebsd-arm,
+	freebsd-arm64,
+	freebsd-riscv64,
+	illumos-amd64,
+	ios-amd64,
+	ios-arm64,
+	js-wasm,
+	linux-386,
+	linux-amd64,
+	linux-arm,
+	linux-arm64,
+	linux-loong64,
+	linux-mips,
+	linux-mips64,
+	linux-mips64le,
+	linux-mipsle,
+	linux-ppc64,
+	linux-ppc64le,
+	linux-riscv64,
+	linux-s390x,
+	linux-sparc64,
+	netbsd-386,
+	netbsd-amd64,
+	netbsd-arm,
+	netbsd-arm64,
+	openbsd-386,
+	openbsd-amd64,
+	openbsd-arm,
+	openbsd-arm64,
+	openbsd-ppc64,
+	openbsd-riscv64,
+	plan9-386,
+	plan9-amd64,
+	plan9-arm,
+	solaris-amd64,
+	wasip1-wasm,
+	windows-386,
+	windows-amd64,
+	windows-arm64
+}
+description: counts target Go port usage distribution
+type: partition
+issue: https://go.dev/issue/79214
+program: cmd/go
+version: go1.27