{{- /*
Copyright Broadcom, Inc. All Rights Reserved.
SPDX-License-Identifier: APACHE-2.0
*/}}

{{- if and .Values.prometheus.enabled .Values.prometheus.defaultRules.create .Values.prometheus.defaultRules.rules.alertmanager }}
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: {{ printf "%s-alertmanager.rules" (include "kube-prometheus.prometheus.fullname" .) }}
  namespace: {{ include "common.names.namespace" . | quote }}
  labels: {{ include "kube-prometheus.prometheus.labels" . | nindent 4 }}
  {{- if .Values.commonAnnotations }}
  annotations: {{- include "common.tplvalues.render" ( dict "value" .Values.commonAnnotations "context" . ) | nindent 4 }}
  {{- end }}
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="foo-alertmanager",namespace="default"}[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
            # https://www.robustperception.io/alerting-on-gauges-in-prometheus-2-0 for details.
              max_over_time(alertmanager_cluster_members{job="foo-alertmanager",namespace="default"}[5m])
            < on (namespace,service,cluster) group_left
              count by (namespace,service,cluster) (max_over_time(alertmanager_cluster_members{job="foo-alertmanager",namespace="default"}[5m]))
          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: |-
            (
              rate(alertmanager_notifications_failed_total{job="foo-alertmanager",namespace="default"}[15m])
            /
              ignoring (reason) group_left rate(alertmanager_notifications_total{job="foo-alertmanager",namespace="default"}[15m])
            )
            > 0.01
          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) (
              rate(alertmanager_notifications_failed_total{job="foo-alertmanager",namespace="default", integration=~`.*`}[15m])
            /
              ignoring (reason) group_left rate(alertmanager_notifications_total{job="foo-alertmanager",namespace="default", integration=~`.*`}[15m])
            )
            > 0.01
          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 {{`{{`}} $value | humanizePercentage {{`}}`}}.
            runbook_url: https://runbooks.prometheus-operator.dev/runbooks/alertmanager/alertmanagerclusterfailedtosendalerts
            summary: All Alertmanager instances in a cluster failed to send notifications to a non-critical integration.
          expr: |-
            min by (namespace,service, integration) (
              rate(alertmanager_notifications_failed_total{job="foo-alertmanager",namespace="default", integration!~`.*`}[15m])
            /
              ignoring (reason) group_left rate(alertmanager_notifications_total{job="foo-alertmanager",namespace="default", integration!~`.*`}[15m])
            )
            > 0.01
          for: 5m
          labels:
            severity: warning
        - alert: AlertmanagerConfigInconsistent
          annotations:
            description: Alertmanager instances within the {{`{{`}}$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,cluster) (
              count_values by (namespace,service,cluster) ("config_hash", alertmanager_config_hash{job="foo-alertmanager",namespace="default"})
            )
            != 1
          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: |-
            (
              count by (namespace,service,cluster) (
                avg_over_time(up{job="foo-alertmanager",namespace="default"}[5m]) < 0.5
              )
            /
              count by (namespace,service,cluster) (
                up{job="foo-alertmanager",namespace="default"}
              )
            )
            >= 0.5
          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: |-
            (
              count by (namespace,service,cluster) (
                changes(process_start_time_seconds{job="foo-alertmanager",namespace="default"}[10m]) > 4
              )
            /
              count by (namespace,service,cluster) (
                up{job="foo-alertmanager",namespace="default"}
              )
            )
            >= 0.5
          for: 5m
          labels:
            severity: critical
{{- end }}
