apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: sankofa-alerts
  namespace: monitoring
  labels:
    app: sankofa
    prometheus: kube-prometheus
    role: alert-rules
spec:
  groups:
    - name: api
      interval: 30s
      rules:
        # API High Error Rate
        - alert: APIHighErrorRate
          expr: |
            sum(rate(http_requests_total{job="api",status=~"5.."}[5m])) 
            / 
            sum(rate(http_requests_total{job="api"}[5m])) > 0.05
          for: 5m
          labels:
            severity: critical
          annotations:
            summary: "API error rate is above 5%"
            description: "API error rate is {{ $value | humanizePercentage }} for the last 5 minutes"

        # API High Latency
        - alert: APIHighLatency
          expr: |
            histogram_quantile(0.95, 
              sum(rate(http_request_duration_seconds_bucket{job="api"}[5m])) by (le)
            ) > 0.5
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "API p95 latency is above 500ms"
            description: "API p95 latency is {{ $value }}s"

        # API Down
        - alert: APIDown
          expr: up{job="api"} == 0
          for: 1m
          labels:
            severity: critical
          annotations:
            summary: "API is down"
            description: "API service has been down for more than 1 minute"

    - name: portal
      interval: 30s
      rules:
        # Portal High Error Rate
        - alert: PortalHighErrorRate
          expr: |
            sum(rate(http_requests_total{job="portal",status=~"5.."}[5m])) 
            / 
            sum(rate(http_requests_total{job="portal"}[5m])) > 0.05
          for: 5m
          labels:
            severity: critical
          annotations:
            summary: "Portal error rate is above 5%"
            description: "Portal error rate is {{ $value | humanizePercentage }}"

        # Portal Down
        - alert: PortalDown
          expr: up{job="portal"} == 0
          for: 1m
          labels:
            severity: critical
          annotations:
            summary: "Portal is down"
            description: "Portal service has been down for more than 1 minute"

    - name: database
      interval: 30s
      rules:
        # Database High Connection Count
        - alert: DatabaseHighConnections
          expr: |
            pg_stat_database_numbackends{datname="sankofa"} > 80
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Database connection count is high"
            description: "Database has {{ $value }} active connections"

        # Database Slow Queries
        - alert: DatabaseSlowQueries
          expr: |
            pg_stat_activity_count{state="active"} > 10
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Database has slow queries"
            description: "Database has {{ $value }} active queries running for more than 5 minutes"

        # Database Down
        - alert: DatabaseDown
          expr: pg_up == 0
          for: 1m
          labels:
            severity: critical
          annotations:
            summary: "Database is down"
            description: "PostgreSQL database is not responding"

    - name: keycloak
      interval: 30s
      rules:
        # Keycloak Down
        - alert: KeycloakDown
          expr: up{job="keycloak"} == 0
          for: 1m
          labels:
            severity: critical
          annotations:
            summary: "Keycloak is down"
            description: "Keycloak authentication service is down"

        # Keycloak High Authentication Failures
        - alert: KeycloakHighAuthFailures
          expr: |
            sum(rate(keycloak_login_failures_total[5m])) > 10
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "High authentication failure rate"
            description: "Keycloak has {{ $value }} authentication failures per second"

    - name: infrastructure
      interval: 30s
      rules:
        # High CPU Usage
        - alert: HighCPUUsage
          expr: |
            (1 - avg(rate(container_cpu_usage_seconds_total{container!="POD"}[5m]))) < 0.1
          for: 10m
          labels:
            severity: warning
          annotations:
            summary: "High CPU usage"
            description: "CPU usage is above 90% for 10 minutes"

        # High Memory Usage
        - alert: HighMemoryUsage
          expr: |
            (1 - (container_memory_working_set_bytes{container!="POD"} / container_spec_memory_limit_bytes)) < 0.1
          for: 10m
          labels:
            severity: warning
          annotations:
            summary: "High memory usage"
            description: "Memory usage is above 90% for 10 minutes"

        # Pod CrashLooping
        - alert: PodCrashLooping
          expr: |
            rate(kube_pod_container_status_restarts_total[15m]) > 0
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Pod is crash looping"
            description: "Pod {{ $labels.pod }} in namespace {{ $labels.namespace }} is crash looping"

        # Disk Space Low
        - alert: DiskSpaceLow
          expr: |
            (node_filesystem_avail_bytes{mountpoint="/"} / node_filesystem_size_bytes{mountpoint="/"}) < 0.1
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "Disk space is low"
            description: "Disk space is below 10% on {{ $labels.instance }}"

    - name: backups
      interval: 1h
      rules:
        # Backup Failed
        - alert: BackupFailed
          expr: |
            time() - backup_last_success_timestamp > 86400
          for: 1h
          labels:
            severity: critical
          annotations:
            summary: "Backup has not run in 24 hours"
            description: "Last successful backup was more than 24 hours ago"

        # Backup Too Old
        - alert: BackupTooOld
          expr: |
            time() - backup_last_success_timestamp > 172800
          for: 1h
          labels:
            severity: critical
          annotations:
            summary: "Backup is more than 48 hours old"
            description: "Last successful backup was {{ $value }} seconds ago"