- alert: MemcachedLowHitRatio
  expr: rate(memcached_get_hits_total[5m]) / (rate(memcached_get_hits_total[5m]) + rate(memcached_get_misses_total[5m])) < 0.85
  for: 10m
  labels:
    severity: warning

- alert: MemcachedEvictionNonZero
  expr: rate(memcached_evicted_nonzero_total[5m]) > 0.1  # >1 раз в 10 сек
  for: 5m
  labels:
    severity: warning

- alert: MemcachedOutOfMemory
  expr: memcached_listen_disabled_num > 0
  for: 1m
  labels:
    severity: critical