groups:
  - name: symbols-availability
    rules:
      - alert: SymbolsDown
        expr: up{job="symbols"} == 0
        for: 5m
        labels:
          severity: page
          service: symbols
        annotations:
          summary: "Symbols.Server instance is down"
          description: "symbols scrape target has been down for 5 minutes"
      - alert: SymbolsErrorRateHigh
        expr: rate(http_requests_total{job="symbols",status=~"5.."}[5m]) > 0
        for: 2m
        labels:
          severity: critical
          service: symbols
        annotations:
          summary: "Symbols.Server error rate is elevated"
          description: "5xx responses detected for Symbols.Server"