probe.Start() starts an in-process flight recorder and serves its latest snapshot over HTTP — one goroutine, no other setup.

import "github.com/MichaelMure/gogc98/probe"

func main() {
    go probe.Start()
    // ... your program ...
}

go get github.com/MichaelMure/gogc98/probe

probe is its own Go module, separate from the bridge/visualizer — pulling it in doesn't drag in the visualizer's own dependencies (golang.org/x/exp/trace, golang.org/x/net), just runtime/trace and net/http from the standard library.

The process must be launched with GODEBUG=traceallocfree=1 set in its environment — the Go runtime reads GODEBUG before any Go code runs, including init(), so this can't be set from within the program itself. probe.Start() checks for it and exits with a clear error if it's missing.

GODEBUG=traceallocfree=1 go run .

Then run the bridge against it — no need to clone this repo first, go run fetches and runs it directly (defaults already match probe.Addr, so no flags are actually required):

go run github.com/MichaelMure/gogc98@latest -target http://127.0.0.1:7999/snapshot

If you'd rather not take the dependency, this is the entire package — paste it into your own code:

import (
    "log"
    "net/http"
    "runtime/trace"
    "time"
)

func startGogc98Probe() {
    fr := trace.NewFlightRecorder(trace.FlightRecorderConfig{
        MinAge:   200 * time.Millisecond,
        MaxBytes: 8 << 20,
    })
    if err := fr.Start(); err != nil {
        log.Fatal("gogc98 probe: starting flight recorder: ", err)
    }

    mux := http.NewServeMux()
    mux.HandleFunc("/snapshot", func(w http.ResponseWriter, r *http.Request) {
        if _, err := fr.WriteTo(w); err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
        }
    })
    log.Print("gogc98 probe: snapshot endpoint on http://127.0.0.1:7999/snapshot")
    log.Fatal(http.ListenAndServe("127.0.0.1:7999", mux))
}

Run it the same way, in its own goroutine, with the same GODEBUG=traceallocfree=1 requirement as above:

func main() {
    go startGogc98Probe()
    // ... your program ...
}

GODEBUG=traceallocfree=1 go run .