3.6 KiB
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Overview
{{< panel style="danger" >}} Jsonnet source code is available at github.com/grafana/jsonnet-libs {{< /panel >}}
Alerts
{{< panel style="warning" >}} Complete list of pregenerated alerts is available here. {{< /panel >}}
varnish-cache
VarnishCacheLowCacheHitRate
{{< code lang="yaml" >}} alert: VarnishCacheLowCacheHitRate annotations: description: The Cache hit rate is {{ printf "%.0f" $value }} percent over the last 5 minutes on {{$labels.instance}}, which is below the threshold of 80 percent. summary: Cache is not answering a sufficient percentage of read requests. expr: | 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) for: 10m labels: severity: warning {{< /code >}}
VarnishCacheHighMemoryUsage
{{< code lang="yaml" >}} alert: VarnishCacheHighMemoryUsage annotations: description: Current Memory Usage is {{ printf "%.0f" $value }} percent on {{$labels.instance}}, which is above the threshold of 90 percent. summary: Varnish Cache is running low on available memory. expr: | (varnish_sma_g_bytes{type="s0"} / (varnish_sma_g_bytes{type="s0"} + varnish_sma_g_space{type="s0"})) * 100 > 90 for: 5m labels: severity: warning {{< /code >}}
VarnishCacheHighCacheEvictionRate
{{< code lang="yaml" >}} alert: VarnishCacheHighCacheEvictionRate annotations: description: The Cache has evicted {{ printf "%.0f" $value }} objects over the last 5 minutes on {{$labels.instance}}, which is above the threshold of 0. summary: The cache is evicting too many objects. expr: | increase(varnish_main_n_lru_nuked[5m]) > 0 for: 5m labels: severity: critical {{< /code >}}
VarnishCacheHighSaturation
{{< code lang="yaml" >}} alert: VarnishCacheHighSaturation annotations: description: The thread queue length is {{ printf "%.0f" $value }} over the last 5 minutes on {{$labels.instance}}, which is above the threshold of 0. summary: There are too many threads in queue, Varnish is saturated and responses are slowed. expr: | varnish_main_thread_queue_len > 0 for: 5m labels: severity: warning {{< /code >}}
VarnishCacheSessionsDropping
{{< code lang="yaml" >}} alert: VarnishCacheSessionsDropping annotations: description: The amount of sessions dropped is {{ printf "%.0f" $value }} over the last 5 minutes on {{$labels.instance}}, which is above the threshold of 0. summary: Incoming requests are being dropped due to a lack of free worker threads. expr: | increase(varnish_main_sessions{type="dropped"}[5m]) > 0 for: 5m labels: severity: critical {{< /code >}}
VarnishCacheBackendUnhealthy
{{< code lang="yaml" >}} alert: VarnishCacheBackendUnhealthy annotations: description: The amount of unhealthy backend statuses detected is {{ printf "%.0f" $value }} over the last 5 minutes on {{$labels.instance}}, which is above the threshold of 0. summary: Backend has been marked as unhealthy due to slow 200 responses. expr: | increase(varnish_main_backend_unhealthy[5m]) > 0 for: 5m labels: severity: critical {{< /code >}}
Dashboards
Following dashboards are generated from mixins and hosted on github: