{
  "id": "go/grpc-unavailable-load-balancer-no-backends",
  "signature": "rpc error: code = Unavailable desc = no healthy upstream",
  "signature_zh": "rpc 错误：代码 = Unavailable 描述 = 没有健康的上游",
  "regex": "rpc\\ error:\\ code\\ =\\ Unavailable\\ desc\\ =\\ no\\ healthy\\ upstream",
  "domain": "go",
  "category": "network_error",
  "subcategory": null,
  "root_cause": "The load balancer or service mesh cannot find any healthy backend instances to route the request.",
  "root_cause_type": "generic",
  "root_cause_zh": "负载均衡器或服务网格找不到任何健康的后端实例来路由请求。",
  "versions": [
    {
      "version": "1.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Backends remain unhealthy; client restart doesn't fix server issues.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "New replicas may also fail health checks due to same issue.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.85,
      "how": "// Configure health checks: grpc.HealthCheck(healthpb.NewHealthClient(conn))",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.8,
      "how": "// Configure destination rules with outlier detection.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-05-30",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}