mirror of
https://github.com/samber/awesome-prometheus-alerts.git
synced 2026-06-22 01:17:19 +08:00
91 lines
4.9 KiB
YAML
91 lines
4.9 KiB
YAML
groups:
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- name: MemcachedExporter
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rules:
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# 1m delay allows a restart without triggering an alert.
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- alert: MemcachedDown
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expr: 'memcached_up == 0'
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for: 1m
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labels:
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severity: critical
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annotations:
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summary: Memcached down (instance {{ $labels.instance }})
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description: "Memcached instance is down on {{ $labels.instance }}\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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- alert: MemcachedConnectionLimitApproaching(>80%)
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expr: '(memcached_current_connections / memcached_max_connections * 100) > 80 and memcached_max_connections > 0'
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for: 2m
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labels:
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severity: warning
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annotations:
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summary: Memcached connection limit approaching (> 80%) (instance {{ $labels.instance }})
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description: "Memcached connection usage is above 80% on {{ $labels.instance }} (current value: {{ $value }}%)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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- alert: MemcachedConnectionLimitApproaching(>95%)
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expr: '(memcached_current_connections / memcached_max_connections * 100) > 95 and memcached_max_connections > 0'
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for: 2m
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labels:
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severity: critical
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annotations:
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summary: Memcached connection limit approaching (> 95%) (instance {{ $labels.instance }})
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description: "Memcached connection usage is above 95% on {{ $labels.instance }} (current value: {{ $value }}%)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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- alert: MemcachedOutOfMemoryErrors
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expr: 'sum without (slab) (rate(memcached_slab_items_outofmemory_total[5m])) > 0.05'
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Memcached out of memory errors (instance {{ $labels.instance }})
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description: "Memcached is returning out-of-memory errors on {{ $labels.instance }} ({{ $value }} errors/s)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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# High memory usage is expected if the cache is well-utilized. This alert fires when it approaches the configured limit, which may cause evictions.
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- alert: MemcachedMemoryUsageHigh(>90%)
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expr: '(memcached_current_bytes / memcached_limit_bytes * 100) > 90 and memcached_limit_bytes > 0'
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Memcached memory usage high (> 90%) (instance {{ $labels.instance }})
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description: "Memcached memory usage is above 90% on {{ $labels.instance }} (current value: {{ $value }}%)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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# A sustained eviction rate indicates memory pressure. Consider increasing memcached memory limit or reducing cache usage. Threshold of 10 evictions/s is a rough default — adjust based on your workload.
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- alert: MemcachedHighEvictionRate
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expr: 'rate(memcached_items_evicted_total[5m]) > 10'
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Memcached high eviction rate (instance {{ $labels.instance }})
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description: "Memcached is evicting items at a high rate on {{ $labels.instance }} ({{ $value }} evictions/s)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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# A low hit rate may indicate poor cache utilization, incorrect cache keys, or TTLs that are too short. Threshold of 80% is a rough default — adjust based on your workload and access patterns.
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- alert: MemcachedLowCacheHitRate(<80%)
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expr: '(rate(memcached_commands_total{command="get", status="hit"}[5m]) / (rate(memcached_commands_total{command="get", status="hit"}[5m]) + rate(memcached_commands_total{command="get", status="miss"}[5m])) * 100) < 80 and (rate(memcached_commands_total{command="get", status="hit"}[5m]) + rate(memcached_commands_total{command="get", status="miss"}[5m])) > 0'
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for: 10m
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labels:
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severity: warning
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annotations:
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summary: Memcached low cache hit rate (< 80%) (instance {{ $labels.instance }})
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description: "Memcached cache hit rate is below 80% on {{ $labels.instance }} (current value: {{ $value }}%)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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- alert: MemcachedConnectionsRejected
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expr: 'increase(memcached_connections_rejected_total[5m]) > 3'
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Memcached connections rejected (instance {{ $labels.instance }})
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description: "Memcached is rejecting connections on {{ $labels.instance }} ({{ $value }} rejections in the last 5m)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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- alert: MemcachedItemsTooLarge
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expr: 'increase(memcached_item_too_large_total[5m]) > 3'
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for: 5m
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labels:
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severity: info
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annotations:
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summary: Memcached items too large (instance {{ $labels.instance }})
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description: "Memcached is rejecting items exceeding max-item-size on {{ $labels.instance }} ({{ $value }} rejections in the last 5m)\n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
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