API 健康监控巡检引擎（专业版）

输入

judge_health(status,latency_ms,threshold_ms=500)；sla_availability(up,total)；alert_level(consecutive_fail)

输出

healthy/degraded/down；(green|yellow|red, 可用率%)；none/warn/critical/page

硬性规则

1. 非2xx/3xx一律 down；超延迟阈值 degraded。
2. 可用率≥99.9绿、≥99黄、否则红；total≤0 返回(unknown,0.0)。
3. 连续失败 1→warn、2→critical、≥3→page。

示例

judge_health(200,50) → healthy
judge_health(200,800) → degraded
sla_availability(995,1000) → ("yellow",99.5)
alert_level(3) → page

Python 引擎（可独立运行）

# -*- coding: utf-8 -*-
def judge_health(status, latency_ms, threshold_ms=500):
    if not (200 <= int(status) < 400):
        return "down"
    if latency_ms > threshold_ms:
        return "degraded"
    return "healthy"

def sla_availability(up_checks, total_checks):
    if total_checks <= 0:
        return "unknown", 0.0
    rate = round(up_checks / total_checks * 100, 2)
    if rate >= 99.9: level = "green"
    elif rate >= 99.0: level = "yellow"
    else: level = "red"
    return level, rate

def alert_level(consecutive_fail):
    if consecutive_fail <= 0: return "none"
    if consecutive_fail == 1: return "warn"
    if consecutive_fail == 2: return "critical"
    return "page"