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67 lines
2.8 KiB
YAML
67 lines
2.8 KiB
YAML
groups:
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- name: varnish-cache
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rules:
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- alert: VarnishCacheLowCacheHitRate
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annotations:
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description: The Cache hit rate is {{ printf "%.0f" $value }} percent over the
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last 5 minutes on {{$labels.instance}}, which is below the threshold of 80
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percent.
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summary: Cache is not answering a sufficient percentage of read requests.
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expr: |
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increase(varnish_main_cache_hit[10m]) / (clamp_min((increase(varnish_main_cache_hit[10m]) + increase(varnish_main_cache_miss[10m])), 1)) * 100 < 80 and (increase(varnish_main_cache_hit[10m]) + increase(varnish_main_cache_miss[10m]) > 0)
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for: 10m
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labels:
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severity: warning
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- alert: VarnishCacheHighMemoryUsage
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annotations:
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description: Current Memory Usage is {{ printf "%.0f" $value }} percent on {{$labels.instance}},
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which is above the threshold of 90 percent.
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summary: Varnish Cache is running low on available memory.
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expr: |
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(varnish_sma_g_bytes{type="s0"} / (varnish_sma_g_bytes{type="s0"} + varnish_sma_g_space{type="s0"})) * 100 > 90
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for: 5m
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labels:
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severity: warning
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- alert: VarnishCacheHighCacheEvictionRate
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annotations:
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description: The Cache has evicted {{ printf "%.0f" $value }} objects over the
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last 5 minutes on {{$labels.instance}}, which is above the threshold of 0.
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summary: The cache is evicting too many objects.
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expr: |
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increase(varnish_main_n_lru_nuked[5m]) > 0
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for: 5m
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labels:
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severity: critical
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- alert: VarnishCacheHighSaturation
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annotations:
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description: The thread queue length is {{ printf "%.0f" $value }} over the
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last 5 minutes on {{$labels.instance}}, which is above the threshold of 0.
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summary: There are too many threads in queue, Varnish is saturated and responses
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are slowed.
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expr: |
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varnish_main_thread_queue_len > 0
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for: 5m
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labels:
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severity: warning
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- alert: VarnishCacheSessionsDropping
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annotations:
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description: The amount of sessions dropped is {{ printf "%.0f" $value }} over
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the last 5 minutes on {{$labels.instance}}, which is above the threshold of
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0.
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summary: Incoming requests are being dropped due to a lack of free worker threads.
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expr: |
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increase(varnish_main_sessions{type="dropped"}[5m]) > 0
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for: 5m
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labels:
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severity: critical
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- alert: VarnishCacheBackendUnhealthy
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annotations:
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description: The amount of unhealthy backend statuses detected is {{ printf
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"%.0f" $value }} over the last 5 minutes on {{$labels.instance}}, which is
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above the threshold of 0.
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summary: Backend has been marked as unhealthy due to slow 200 responses.
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expr: |
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increase(varnish_main_backend_unhealthy[5m]) > 0
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for: 5m
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labels:
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severity: critical
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