Snapshot

Snapshot() is the one addition to the gobreaker API. It returns a point-in-time, read-only view of the signals fluxgo uses to decide. All fields are read under their component locks, so it is safe to call concurrently.

snap := cb.Snapshot()
fmt.Println(snap.State)            // Closed / Open / HalfOpen
fmt.Println(snap.ThetaT)           // current adaptive threshold
fmt.Println(snap.FailureRate)      // failure rate in the outcome window
fmt.Println(snap.DegradedRequests) // slow requests classified as degraded
fmt.Println(snap.IsWarmingUp)      // baseline not captured yet?

Fields

Field	Type	Meaning
`State`	`State`	`Closed`, `Open` or `HalfOpen`
`St`	`float64`	Current EWMA latency (ms)
`Pt`	`float64`	Current rolling percentile, P95 or P99 (ms)
`Dt`	`float64`	Degradation ratio
`ThetaT`	`float64`	Current adaptive threshold θₜ
`Sbase`	`float64`	Healthy-state EWMA baseline
`Pbase`	`float64`	Healthy-state percentile baseline
`FailureRate`	`float64`	Current failure rate in the outcome window
`DegradedRequests`	`int64`	Requests classified as slow
`IsWarmingUp`	`bool`	True until the baseline is set

Exposing it over HTTP

A small debug endpoint is often enough to watch the breaker from a dashboard or a terminal:

http.HandleFunc("/debug/cb", func(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    _ = json.NewEncoder(w).Encode(cb.Snapshot())
})