---
{{- if .Values.nfc_monitoring.loki.enabled | default false -}}
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  labels:
    app.kubernetes.io/component: logging
    app.kubernetes.io/name: loki
    app.kubernetes.io/part-of: {{ $.Chart.Name }}
    app.kubernetes.io/version: {{ $.Chart.Version }}
    app.kubernetes.io/managed-by: {{ $.Release.Service }}
    prometheus: k8s
    role: alert-rules
  name: loki
  namespace: monitoring
spec:
  groups:
  - name: loki_rules
    rules:
    - expr: histogram_quantile(0.99, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, job))
      record: cluster_job:loki_request_duration_seconds:99quantile
    - expr: histogram_quantile(0.50, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, job))
      record: cluster_job:loki_request_duration_seconds:50quantile
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, job) / sum(rate(loki_request_duration_seconds_count[1m]))
        by (cluster, job)
      record: cluster_job:loki_request_duration_seconds:avg
    - expr: sum(rate(loki_request_duration_seconds_bucket[1m])) by (le, cluster, job)
      record: cluster_job:loki_request_duration_seconds_bucket:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, job)
      record: cluster_job:loki_request_duration_seconds_sum:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_count[1m])) by (cluster, job)
      record: cluster_job:loki_request_duration_seconds_count:sum_rate
    - expr: histogram_quantile(0.99, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, job, route))
      record: cluster_job_route:loki_request_duration_seconds:99quantile
    - expr: histogram_quantile(0.50, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, job, route))
      record: cluster_job_route:loki_request_duration_seconds:50quantile
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, job, route)
        / sum(rate(loki_request_duration_seconds_count[1m])) by (cluster, job, route)
      record: cluster_job_route:loki_request_duration_seconds:avg
    - expr: sum(rate(loki_request_duration_seconds_bucket[1m])) by (le, cluster, job,
        route)
      record: cluster_job_route:loki_request_duration_seconds_bucket:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, job, route)
      record: cluster_job_route:loki_request_duration_seconds_sum:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_count[1m])) by (cluster, job, route)
      record: cluster_job_route:loki_request_duration_seconds_count:sum_rate
    - expr: histogram_quantile(0.99, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, namespace, job, route))
      record: cluster_namespace_job_route:loki_request_duration_seconds:99quantile
    - expr: histogram_quantile(0.50, sum(rate(loki_request_duration_seconds_bucket[1m]))
        by (le, cluster, namespace, job, route))
      record: cluster_namespace_job_route:loki_request_duration_seconds:50quantile
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, namespace,
        job, route) / sum(rate(loki_request_duration_seconds_count[1m])) by (cluster,
        namespace, job, route)
      record: cluster_namespace_job_route:loki_request_duration_seconds:avg
    - expr: sum(rate(loki_request_duration_seconds_bucket[1m])) by (le, cluster, namespace,
        job, route)
      record: cluster_namespace_job_route:loki_request_duration_seconds_bucket:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_sum[1m])) by (cluster, namespace,
        job, route)
      record: cluster_namespace_job_route:loki_request_duration_seconds_sum:sum_rate
    - expr: sum(rate(loki_request_duration_seconds_count[1m])) by (cluster, namespace,
        job, route)
      record: cluster_namespace_job_route:loki_request_duration_seconds_count:sum_rate

  - name: loki_alerts
    rules:
    - alert: LokiRequestErrors
      annotations:
        message: |
          {{ `{{` }} $labels.job }} {{ `{{` }} $labels.route }} is experiencing {{ `{{` }} printf "%.2f" $value }}% errors.
      expr: |
        100 * sum(rate(loki_request_duration_seconds_count{status_code=~"5.."}[2m])) by (namespace, job, route)
          /
        sum(rate(loki_request_duration_seconds_count[2m])) by (namespace, job, route)
          > 10
      for: 15m
      labels:
        severity: critical
    - alert: LokiRequestPanics
      annotations:
        message: |
          {{ `{{` }} $labels.job }} is experiencing {{ `{{` }} printf "%.2f" $value }}% increase of panics.
      expr: |
        sum(increase(loki_panic_total[10m])) by (namespace, job) > 0
      labels:
        severity: critical
    - alert: LokiRequestLatency
      annotations:
        message: |
          {{ `{{` }} $labels.job }} {{ `{{` }} $labels.route }} is experiencing {{ `{{` }} printf "%.2f" $value }}s 99th percentile latency.
      expr: |
        cluster_namespace_job_route:loki_request_duration_seconds:99quantile{route!~"(?i).*tail.*|/schedulerpb.SchedulerForQuerier/QuerierLoop"} > 1
      for: 15m
      labels:
        severity: critical
    - alert: LokiTooManyCompactorsRunning
      annotations:
        message: |
          {{ `{{` }} $labels.cluster }} {{ `{{` }} $labels.namespace }} has had {{ `{{` }} printf "%.0f" $value }} compactors running for more than 5m. Only one compactor should run at a time.
      expr: |
        sum(loki_boltdb_shipper_compactor_running) by (namespace, cluster) > 1
      for: 5m
      labels:
        severity: warning

{{- end -}}