scenarios

type Config struct {
	Bin    string   // path of the nself binary under test
	Runs   int      // measured runs per probe
	Warmup int      // discarded runs per probe, before the measured ones
	Env    []string // extra KEY=VALUE entries appended to the probe environment

	// Timeout kills one probe run that takes longer (0 means DefaultTimeout).
	Timeout time.Duration
}

type Opts struct {
	Env      []string      // extra KEY=VALUE entries appended to the probe environment
	Slowdown float64       // self-test only: > 1 makes the timed window Slowdown x the measured time
	Timeout  time.Duration // kill the process after this long; 0 means DefaultTimeout
}

type Probe struct {
	Metric string
	Args   []string
	Exit   int
}

type ProbeFailure struct {
	Metric string
	Side   string // "base" or "head" for `ab`, empty for `run`
	Reason string
}

type Prober interface {
	Probes() []Probe
}

type Sample struct {
	Metric string
	Unit   string
	Value  float64
}

type Scenario interface {
	Name() string
	Run(ctx context.Context, cfg Config) ([]Sample, error)
}