Redis缓存命中率异常告警配置

Redis缓存命中率异常告警配置

核心监控指标

Redis命中率 = (get命令命中数 / (get命令命中数 + get命令未命中数)) × 100%

监控配置步骤

1. 指标采集

# 使用redis-cli获取统计信息
redis-cli info | grep -E "keyspace|hit|miss"

2. 计算命中率

import redis
import time

class RedisMonitor:
    def __init__(self, host='localhost', port=6379):
        self.r = redis.Redis(host=host, port=port)
        
    def get_hit_rate(self):
        info = self.r.info()
        keyspace = info.get('keyspace', {})
        # 获取命中率
        hits = info.get('keyspace_hits', 0)
        misses = info.get('keyspace_misses', 0)
        total = hits + misses
        return (hits / total * 100) if total > 0 else 0

3. 告警阈值设置

• 正常范围：85% - 95%
• 告警阈值：命中率 < 70% 或 > 95%

Prometheus监控配置

# prometheus.yml
scrape_configs:
  - job_name: 'redis'
    static_configs:
      - targets: ['localhost:9121']
metrics_path: /metrics

告警规则配置

# alert.rules.yml
- alert: RedisHighMissRate
  expr: rate(redis_keyspace_misses_total[5m]) > 0.05
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Redis缓存命中率异常"
    description: "当前命中率低于70%"

实施建议

1. 建立定期巡检机制
2. 配置多级告警（警告、严重）
3. 结合业务流量峰值调整阈值