apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: {{ printf "%s-%s" (include "kubezero-lib.fullname" $) "alertmanager" | trunc 63 | trimSuffix "-" }}
  namespace: {{ .Release.Namespace }}
  labels:
    {{- include "kubezero-lib.labels" . | nindent 4 }}
spec:
  groups:
  - name: alertmanager.rules
    rules:
    - alert: AlertmanagerFailedReload
      annotations:
        description: Configuration has failed to load for {{`{{`}} $labels.namespace {{`}}`}}/{{`{{`}} $labels.pod{{`}}`}}.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerfailedreload
        summary: Reloading an Alertmanager configuration has failed.
      expr: '# Without max_over_time, failed scrapes could create false negatives, see

        # https://www.robustperception.io/alerting-on-gauges-in-prometheus-2-0 for details.

        max_over_time(alertmanager_config_last_reload_successful{job="alertmanager-main",namespace="monitoring"}[5m]) == 0

        '
      for: 10m
      labels:
        severity: critical
    - alert: AlertmanagerMembersInconsistent
      annotations:
        description: Alertmanager {{`{{`}} $labels.namespace {{`}}`}}/{{`{{`}} $labels.pod{{`}}`}} has only found {{`{{`}} $value {{`}}`}} members of the {{`{{`}}$labels.job{{`}}`}} cluster.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagermembersinconsistent
        summary: A member of an Alertmanager cluster has not found all other cluster members.
      expr: "# Without max_over_time, failed scrapes could create false negatives, see\n# https://www.robustperception.io/alerting-on-gauges-in-prometheus-2-0 for details.\n  max_over_time(alertmanager_cluster_members{job=\"alertmanager-main\",namespace=\"monitoring\"}[5m])\n< on (namespace,service) group_left\n  count by (namespace,service) (max_over_time(alertmanager_cluster_members{job=\"alertmanager-main\",namespace=\"monitoring\"}[5m]))\n"
      for: 15m
      labels:
        severity: critical
    - alert: AlertmanagerFailedToSendAlerts
      annotations:
        description: Alertmanager {{`{{`}} $labels.namespace {{`}}`}}/{{`{{`}} $labels.pod{{`}}`}} failed to send {{`{{`}} $value | humanizePercentage {{`}}`}} of notifications to {{`{{`}} $labels.integration {{`}}`}}.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerfailedtosendalerts
        summary: An Alertmanager instance failed to send notifications.
      expr: "(\n  rate(alertmanager_notifications_failed_total{job=\"alertmanager-main\",namespace=\"monitoring\"}[5m])\n/\n  ignoring (reason) group_left rate(alertmanager_notifications_total{job=\"alertmanager-main\",namespace=\"monitoring\"}[5m])\n)\n> 0.01\n"
      for: 5m
      labels:
        severity: warning
    - alert: AlertmanagerClusterFailedToSendAlerts
      annotations:
        description: The minimum notification failure rate to {{`{{`}} $labels.integration {{`}}`}} sent from any instance in the {{`{{`}}$labels.job{{`}}`}} cluster is {{`{{`}} $value | humanizePercentage {{`}}`}}.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerclusterfailedtosendalerts
        summary: All Alertmanager instances in a cluster failed to send notifications to a critical integration.
      expr: "min by (namespace,service, integration) (\n  rate(alertmanager_notifications_failed_total{job=\"alertmanager-main\",namespace=\"monitoring\", integration=~`.*`}[5m])\n/\n  ignoring (reason) group_left rate(alertmanager_notifications_total{job=\"alertmanager-main\",namespace=\"monitoring\", integration=~`.*`}[5m])\n)\n> 0.01\n"
      for: 5m
      labels:
        severity: critical
    - alert: AlertmanagerClusterFailedToSendAlerts
      annotations:
        description: The minimum notification failure rate to {{`{{`}} $labels.integration {{`}}`}} sent from any instance in the {{`{{`}}$labels.job{{`}}`}} cluster is {{`{{`}} $value | humanizePercentage {{`}}`}}.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerclusterfailedtosendalerts
        summary: All Alertmanager instances in a cluster failed to send notifications to a non-critical integration.
      expr: "min by (namespace,service, integration) (\n  rate(alertmanager_notifications_failed_total{job=\"alertmanager-main\",namespace=\"monitoring\", integration!~`.*`}[5m])\n/\n  ignoring (reason) group_left rate(alertmanager_notifications_total{job=\"alertmanager-main\",namespace=\"monitoring\", integration!~`.*`}[5m])\n)\n> 0.01\n"
      for: 5m
      labels:
        severity: warning
    - alert: AlertmanagerConfigInconsistent
      annotations:
        description: Alertmanager instances within the {{`{{`}}$labels.job{{`}}`}} cluster have different configurations.
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerconfiginconsistent
        summary: Alertmanager instances within the same cluster have different configurations.
      expr: "count by (namespace,service) (\n  count_values by (namespace,service) (\"config_hash\", alertmanager_config_hash{job=\"alertmanager-main\",namespace=\"monitoring\"})\n)\n!= 1\n"
      for: 20m
      labels:
        severity: critical
    - alert: AlertmanagerClusterDown
      annotations:
        description: '{{`{{`}} $value | humanizePercentage {{`}}`}} of Alertmanager instances within the {{`{{`}}$labels.job{{`}}`}} cluster have been up for less than half of the last 5m.'
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerclusterdown
        summary: Half or more of the Alertmanager instances within the same cluster are down.
      expr: "(\n  count by (namespace,service) (\n    avg_over_time(up{job=\"alertmanager-main\",namespace=\"monitoring\"}[5m]) < 0.5\n  )\n/\n  count by (namespace,service) (\n    up{job=\"alertmanager-main\",namespace=\"monitoring\"}\n  )\n)\n>= 0.5\n"
      for: 5m
      labels:
        severity: critical
    - alert: AlertmanagerClusterCrashlooping
      annotations:
        description: '{{`{{`}} $value | humanizePercentage {{`}}`}} of Alertmanager instances within the {{`{{`}}$labels.job{{`}}`}} cluster have restarted at least 5 times in the last 10m.'
        runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerclustercrashlooping
        summary: Half or more of the Alertmanager instances within the same cluster are crashlooping.
      expr: "(\n  count by (namespace,service) (\n    changes(process_start_time_seconds{job=\"alertmanager-main\",namespace=\"monitoring\"}[10m]) > 4\n  )\n/\n  count by (namespace,service) (\n    up{job=\"alertmanager-main\",namespace=\"monitoring\"}\n  )\n)\n>= 0.5\n"
      for: 5m
      labels:
        severity: critical

