coredns

alert: CoreDNSDown
annotations:
  description: CoreDNS has disappeared from Prometheus target discovery.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsdown
  summary: CoreDNS has disappeared from Prometheus target discovery.
expr: |
  absent(up{job="kube-dns"} == 1)  
for: 15m
labels:
  severity: critical

alert: CoreDNSLatencyHigh
annotations:
  description: CoreDNS has 99th percentile latency of {{ $value }} seconds for server {{ $labels.server }} zone {{ $labels.zone }} .
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednslatencyhigh
  summary: CoreDNS is experiencing high 99th percentile latency.
expr: |
  histogram_quantile(0.99, sum(rate(coredns_dns_request_duration_seconds_bucket{job="kube-dns"}[5m])) without (instance,pod)) > 4  
for: 10m
labels:
  severity: critical

alert: CoreDNSErrorsHigh
annotations:
  description: CoreDNS is returning SERVFAIL for {{ $value | humanizePercentage }} of requests.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednserrorshigh
  summary: CoreDNS is returning SERVFAIL.
expr: |
  sum without (pod, instance, server, zone, view, rcode, plugin) (rate(coredns_dns_responses_total{job="kube-dns",rcode="SERVFAIL"}[5m]))
    /
  sum without (pod, instance, server, zone, view, rcode, plugin) (rate(coredns_dns_responses_total{job="kube-dns"}[5m])) > 0.03  
for: 10m
labels:
  severity: critical

alert: CoreDNSErrorsHigh
annotations:
  description: CoreDNS is returning SERVFAIL for {{ $value | humanizePercentage }} of requests.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednserrorshigh
  summary: CoreDNS is returning SERVFAIL.
expr: |
  sum without (pod, instance, server, zone, view, rcode, plugin) (rate(coredns_dns_responses_total{job="kube-dns",rcode="SERVFAIL"}[5m]))
    /
  sum without (pod, instance, server, zone, view, rcode, plugin) (rate(coredns_dns_responses_total{job="kube-dns"}[5m])) > 0.01  
for: 10m
labels:
  severity: warning

alert: CoreDNSForwardLatencyHigh
annotations:
  description: CoreDNS has 99th percentile latency of {{ $value }} seconds forwarding requests to {{ $labels.to }}.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsforwardlatencyhigh
  summary: CoreDNS is experiencing high latency forwarding requests.
expr: |
  histogram_quantile(0.99, sum(rate(coredns_forward_request_duration_seconds_bucket{job="kube-dns"}[5m])) without (pod, instance, rcode)) > 4  
for: 10m
labels:
  severity: critical

alert: CoreDNSForwardErrorsHigh
annotations:
  description: CoreDNS is returning SERVFAIL for {{ $value | humanizePercentage }} of forward requests to {{ $labels.to }}.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsforwarderrorshigh
  summary: CoreDNS is returning SERVFAIL for forward requests.
expr: |
  sum without (pod, instance, rcode) (rate(coredns_forward_responses_total{job="kube-dns",rcode="SERVFAIL"}[5m]))
    /
  sum without (pod, instance, rcode) (rate(coredns_forward_responses_total{job="kube-dns"}[5m])) > 0.03  
for: 10m
labels:
  severity: critical

alert: CoreDNSForwardErrorsHigh
annotations:
  description: CoreDNS is returning SERVFAIL for {{ $value | humanizePercentage }} of forward requests to {{ $labels.to }}.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsforwarderrorshigh
  summary: CoreDNS is returning SERVFAIL for forward requests.
expr: |
  sum without (pod, instance, rcode) (rate(coredns_forward_responses_total{job="kube-dns",rcode="SERVFAIL"}[5m]))
    /
  sum without (pod, instance, rcode) (rate(coredns_forward_responses_total{job="kube-dns"}[5m])) > 0.01  
for: 10m
labels:
  severity: warning

alert: CoreDNSForwardHealthcheckFailureCount
annotations:
  description: CoreDNS health checks have failed to upstream server {{ $labels.to }}.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsforwardhealthcheckfailurecount
  summary: CoreDNS health checks have failed to upstream server.
expr: |
  sum without (pod, instance) (rate(coredns_forward_healthcheck_failures_total{job="kube-dns"}[5m])) > 0  
for: 10m
labels:
  severity: warning

alert: CoreDNSForwardHealthcheckBrokenCount
annotations:
  description: CoreDNS health checks have failed for all upstream servers.
  runbook_url: https://github.com/povilasv/coredns-mixin/tree/master/runbook.md#alert-name-corednsforwardhealthcheckbrokencount
  summary: CoreDNS health checks have failed for all upstream servers.
expr: |
  sum without (pod, instance) (rate(coredns_forward_healthcheck_broken_total{job="kube-dns"}[5m])) > 0  
for: 10m
labels:
  severity: warning