groups:

- name: NatsExporter

  rules:

    - alert: NatsHighConnectionCount
      expr: 'gnatsd_varz_connections > 100'
      for: 3m
      labels:
        severity: warning
      annotations:
        summary: Nats high connection count (instance {{ $labels.instance }})
        description: "High number of NATS connections ({{ $value }}) for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsHighPendingBytes
      expr: 'gnatsd_connz_pending_bytes > 100000'
      for: 3m
      labels:
        severity: warning
      annotations:
        summary: Nats high pending bytes (instance {{ $labels.instance }})
        description: "High number of NATS pending bytes ({{ $value }}) for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsHighSubscriptionsCount
      expr: 'gnatsd_connz_subscriptions > 50'
      for: 3m
      labels:
        severity: warning
      annotations:
        summary: Nats high subscriptions count (instance {{ $labels.instance }})
        description: "High number of NATS subscriptions ({{ $value }}) for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsHighRoutesCount
      expr: 'gnatsd_varz_routes > 10'
      for: 3m
      labels:
        severity: warning
      annotations:
        summary: Nats high routes count (instance {{ $labels.instance }})
        description: "High number of NATS routes ({{ $value }}) for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsHighMemoryUsage
      expr: 'gnatsd_varz_mem > 200000000' # Adjust based on NATS instance sizing
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: NATS high memory usage (instance {{ $labels.instance }})
        description: "NATS server memory usage is above 200MB for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsSlowConsumers
      expr: 'gnatsd_varz_slow_consumers > 0'
      for: 3m
      labels:
        severity: critical
      annotations:
        summary: Slow consumers in NATS (instance {{ $labels.instance }})
        description: "There are slow consumers in NATS for {{ $labels.instance }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: NatsServerDown
      expr: absent(gnatsd_connz_total)
      for: 5m
      labels:
        severity: critical
      annotations:
        summary: "NATS server is down"
        description: "NATS server has been down for more than 5 minutes."

    - alert: HighNatsCpuUsage
      expr: rate(gnatsd_varz_cpu[5m]) > 0.8
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High CPU usage on NATS server"
        description: "NATS server is using more than 80% CPU for the last 5 minutes."

    - alert: HighNatsConnections
      expr: gnatsd_connz_num_connections > 1000
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High number of connections in NATS"
        description: "NATS server has more than 1000 active connections."

    - alert: HighJetStreamStoreUsage
      expr: gnatsd_varz_jetstream_stats_storage / gnatsd_varz_jetstream_config_max_storage > 0.8
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High JetStream store usage"
        description: "JetStream store usage is over 80%."

    - alert: HighJetStreamMemoryUsage
      expr: gnatsd_varz_jetstream_stats_memory / gnatsd_varz_jetstream_config_max_memory > 0.8
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High JetStream memory usage"
        description: "JetStream memory usage is over 80%."

    - alert: NatsSubscriptionsExceeded
      expr: gnatsd_connz_subscriptions > 1000
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High number of subscriptions in NATS"
        description: "NATS server has more than 1000 active subscriptions."

    - alert: NatsMessagesPending
      expr: gnatsd_connz_pending_bytes > 100000
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High number of pending messages in NATS"
        description: "NATS server has more than 100,000 pending messages."

    - alert: NatsErrors
      expr: increase(gnatsd_varz_jetstream_stats_api_errors[5m]) > 0
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "Errors in NATS"
        description: "NATS server has encountered errors in the last 5 minutes."

    - alert: JetStreamConsumersExceeded
      expr: sum(gnatsd_varz_jetstream_stats_accounts) > 100
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "High number of JetStream consumers"
        description: "JetStream has more than 100 active consumers."

    - alert: NatsAuthTimeouts
      expr: increase(gnatsd_varz_auth_timeout[5m]) > 5
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "Frequent authentication timeouts on NATS"
        description: "There have been more than 5 authentication timeouts in the last 5 minutes."

    - alert: NatsMaxPayloadExceeded
      expr: max(gnatsd_varz_max_payload) > 1000000
      for: 5m
      labels:
        severity: critical
      annotations:
        summary: "Max payload size exceeded in NATS"
        description: "The max payload size allowed by NATS has been exceeded."

    - alert: NatsLeafNodeIssues
      expr: increase(gnatsd_varz_leafnodes[5m]) == 0
      for: 5m
      labels:
        severity: critical
      annotations:
        summary: "Leaf node connection issue in NATS"
        description: "No leaf node connections have been established in the last 5 minutes."

    - alert: NatsPingMaxExceeded
      expr: gnatsd_varz_ping_max > 50
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: "Max ping operations exceeded in NATS"
        description: "The maximum number of ping operations in NATS has exceeded 50."

    - alert: NatsWriteDeadlineExceeded
      expr: gnatsd_varz_write_deadline > 10
      for: 5m
      labels:
        severity: critical
      annotations:
        summary: "Write deadline exceeded in NATS"
        description: "The write deadline has been exceeded in NATS, indicating potential message delivery issues."