from dataclasses import dataclass

@dataclass
class ErrorBudget:
    service: str
    slo_pct: float
    window_days: int
    requests_per_second: float

    @property
    def total_requests(self) -> float:
        return self.requests_per_second * self.window_days * 86400

    @property
    def allowed_error_pct(self) -> float:
        return 1 - (self.slo_pct / 100)

    @property
    def allowed_errors(self) -> float:
        return self.total_requests * self.allowed_error_pct

    @property
    def allowed_downtime_minutes(self) -> float:
        return self.allowed_error_pct * self.window_days * 24 * 60

    def budget_remaining(self, actual_errors: float) -> float:
        """Returns remaining budget as percentage 0–100"""
        return max(0, (1 - actual_errors / self.allowed_errors) * 100)


# Example: Checkout API
checkout = ErrorBudget(
    service="checkout-api",
    slo_pct=99.99,
    window_days=28,
    requests_per_second=1000
)

print(f"Total requests: {checkout.total_requests:,.0f}")
print(f"Allowed errors: {checkout.allowed_errors:,.0f}")
print(f"Allowed downtime: {checkout.allowed_downtime_minutes:.1f} min")
# → Total requests: 2,419,200,000
# → Allowed errors: 241,920
# → Allowed downtime: 4.0 min
SLIs, SLOs, SLAs — מדדי אמינות

SLIs, SLOs, SLAs — מדדי אמינות

SLIs, SLOs, SLAs — מדדי אמינות
