groups:
  - name: ai-stack-alerts
    rules:
      - alert: StackUnhealthy
        expr: up{job="ai-stacks"} == 0
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "Stack {{ $labels.stack_name }} is down"
          description: "AI Stack {{ $labels.stack_name }} has been unhealthy for more than 5 minutes."

      - alert: HighErrorRate
        expr: |
          sum by (stack_name) (rate(opencode_errors_total[5m])) 
          / 
          sum by (stack_name) (rate(opencode_messages_total[5m])) 
          > 0.1
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "High error rate on {{ $labels.stack_name }}"
          description: "Stack {{ $labels.stack_name }} has error rate above 10% for 10 minutes."

      - alert: NoActivity
        expr: |
          time() - opencode_last_activity_timestamp > 3600
        for: 5m
        labels:
          severity: info
        annotations:
          summary: "No activity on {{ $labels.stack_name }}"
          description: "Stack {{ $labels.stack_name }} has had no activity for over 1 hour."

      - alert: HighTokenUsage
        expr: |
          sum by (stack_name) (increase(opencode_tokens_total[1h])) > 100000
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "High token usage on {{ $labels.stack_name }}"
          description: "Stack {{ $labels.stack_name }} has used over 100k tokens in the last hour."

      - alert: LogIngestDown
        expr: up{job="log-ingest"} == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "Log ingest service is down"
          description: "The central log ingest service has been down for more than 2 minutes."

      - alert: LokiDown
        expr: up{job="loki"} == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "Loki is down"
          description: "Loki log aggregation service has been down for more than 2 minutes."