alert

type MWMBAlert struct {
	ID             string
	ShortWindow    time.Duration
	LongWindow     time.Duration
	BurnRateFactor float64
	ErrorBudget    float64
	Severity       Severity
}

type MWMBAlertGroup struct {
	PageQuick   MWMBAlert
	PageSlow    MWMBAlert
	TicketQuick MWMBAlert
	TicketSlow  MWMBAlert
}

type SLO struct {
	ID         string
	TimeWindow time.Duration
	Objective  float64
}

type Severity int

type WindowMetadata struct {
	WindowPeriod time.Duration

	// Alerting required windows.
	// Its a matrix of values with:
	// - Alert severity: ["page", "ticket"].
	// - Measure period: ["long", "short"].
	WindowPageQuickShort   time.Duration
	WindowPageQuickLong    time.Duration
	WindowPageSlowShort    time.Duration
	WindowPageSlowLong     time.Duration
	WindowTicketQuickShort time.Duration
	WindowTicketQuickLong  time.Duration
	WindowTicketSlowShort  time.Duration
	WindowTicketSlowLong   time.Duration

	// Error budget percent consumed for a full time window.
	// Google gives us some defaults in its SRE workbook that work correctly most of the times:
	// - Page quick:   2%
	// - Page slow:    5%
	// - Ticket quick: 10%
	// - Ticket slow:  10%
	ErrorBudgetPercPageQuick   float64
	ErrorBudgetPercPageSlow    float64
	ErrorBudgetPercTicketQuick float64
	ErrorBudgetPercTicketSlow  float64
}