{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://api-evangelist.com/schemas/scalable-systems/load-balancer",
  "title": "Load Balancer Configuration",
  "description": "Schema for a load balancer configuration in a scalable distributed system.",
  "type": "object",
  "required": ["name", "algorithm", "backends"],
  "properties": {
    "name": {
      "type": "string",
      "description": "Identifier for this load balancer."
    },
    "algorithm": {
      "type": "string",
      "enum": ["round-robin", "least-connections", "ip-hash", "weighted-round-robin", "random", "leasttime"],
      "description": "Load balancing algorithm for distributing traffic."
    },
    "layer": {
      "type": "integer",
      "enum": [4, 7],
      "description": "OSI layer: 4 = TCP/UDP, 7 = HTTP/HTTPS."
    },
    "virtualAddress": {
      "type": "string",
      "description": "Virtual IP address or hostname for the load balancer frontend."
    },
    "port": {
      "type": "integer",
      "minimum": 1,
      "maximum": 65535,
      "description": "Listening port."
    },
    "protocol": {
      "type": "string",
      "enum": ["http", "https", "tcp", "udp", "grpc"],
      "description": "Protocol the load balancer handles."
    },
    "stickySession": {
      "type": "object",
      "description": "Session affinity configuration.",
      "properties": {
        "enabled": { "type": "boolean" },
        "cookieName": {
          "type": "string",
          "description": "Cookie name for sticky session routing."
        },
        "ttlSeconds": {
          "type": "integer",
          "description": "Session affinity duration in seconds."
        }
      }
    },
    "healthCheck": {
      "type": "object",
      "description": "Health check configuration for backend servers.",
      "required": ["path", "intervalSeconds"],
      "properties": {
        "path": {
          "type": "string",
          "description": "HTTP path for health check.",
          "example": "/healthz"
        },
        "intervalSeconds": {
          "type": "integer",
          "minimum": 1,
          "description": "Seconds between health checks."
        },
        "timeoutSeconds": {
          "type": "integer",
          "minimum": 1,
          "description": "Seconds to wait for health check response."
        },
        "healthyThreshold": {
          "type": "integer",
          "description": "Consecutive successes required to mark backend healthy."
        },
        "unhealthyThreshold": {
          "type": "integer",
          "description": "Consecutive failures required to mark backend unhealthy."
        }
      }
    },
    "backends": {
      "type": "array",
      "description": "List of backend server instances.",
      "minItems": 1,
      "items": {
        "type": "object",
        "required": ["address", "port"],
        "properties": {
          "address": {
            "type": "string",
            "description": "IP address or hostname of the backend."
          },
          "port": {
            "type": "integer",
            "minimum": 1,
            "maximum": 65535
          },
          "weight": {
            "type": "integer",
            "minimum": 1,
            "maximum": 100,
            "description": "Relative weight for weighted algorithms."
          },
          "maxConnections": {
            "type": "integer",
            "description": "Maximum concurrent connections to this backend."
          },
          "enabled": {
            "type": "boolean",
            "default": true
          }
        }
      }
    },
    "tlsTermination": {
      "type": "object",
      "description": "TLS/SSL termination configuration.",
      "properties": {
        "enabled": { "type": "boolean" },
        "certificatePath": { "type": "string" },
        "privateKeyPath": { "type": "string" },
        "minimumTlsVersion": {
          "type": "string",
          "enum": ["1.2", "1.3"],
          "default": "1.2"
        }
      }
    }
  }
}