{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://appdynamics.com/schemas/appdynamics/application-model.json",
  "title": "AppDynamics Application Model",
  "description": "Schema representing the AppDynamics application monitoring model including applications, tiers, nodes, business transactions, and backends.",
  "type": "object",
  "$defs": {
    "Application": {
      "type": "object",
      "description": "A business application monitored by the AppDynamics Controller.",
      "required": ["id", "name"],
      "properties": {
        "id": {
          "type": "integer",
          "description": "The internal numeric identifier for the application."
        },
        "name": {
          "type": "string",
          "description": "The name of the business application.",
          "minLength": 1,
          "maxLength": 255
        },
        "description": {
          "type": "string",
          "description": "An optional description of the application."
        }
      }
    },
    "Tier": {
      "type": "object",
      "description": "A tier within a monitored business application representing a logical grouping of nodes.",
      "required": ["id", "name"],
      "properties": {
        "id": {
          "type": "integer",
          "description": "The internal numeric identifier for the tier."
        },
        "name": {
          "type": "string",
          "description": "The name of the tier.",
          "minLength": 1,
          "maxLength": 255
        },
        "type": {
          "type": "string",
          "description": "The agent type associated with this tier."
        },
        "agentType": {
          "type": "string",
          "description": "The type of agent instrumentation used by the tier.",
          "enum": [
            "APP_AGENT",
            "MACHINE_AGENT",
            "DOT_NET_APP_AGENT",
            "NODEJS_APP_AGENT",
            "PHP_APP_AGENT",
            "PYTHON_APP_AGENT",
            "GOLANG_SDK"
          ]
        },
        "numberOfNodes": {
          "type": "integer",
          "description": "The number of nodes belonging to this tier.",
          "minimum": 0
        }
      }
    },
    "Node": {
      "type": "object",
      "description": "A node representing a single application instance or process within a tier.",
      "required": ["id", "name", "tierId"],
      "properties": {
        "id": {
          "type": "integer",
          "description": "The internal numeric identifier for the node."
        },
        "name": {
          "type": "string",
          "description": "The name of the node.",
          "minLength": 1,
          "maxLength": 255
        },
        "type": {
          "type": "string",
          "description": "The agent type associated with this node."
        },
        "tierId": {
          "type": "integer",
          "description": "The numeric ID of the tier this node belongs to."
        },
        "tierName": {
          "type": "string",
          "description": "The name of the tier this node belongs to."
        },
        "machineId": {
          "type": "integer",
          "description": "The numeric ID of the machine hosting this node."
        },
        "machineName": {
          "type": "string",
          "description": "The name of the machine hosting this node."
        },
        "machineOSType": {
          "type": "string",
          "description": "The operating system type of the host machine.",
          "enum": ["Linux", "Windows", "Mac OS X", "Solaris", "AIX"]
        },
        "agentType": {
          "type": "string",
          "description": "The type of agent instrumentation used by the node."
        },
        "appAgentVersion": {
          "type": "string",
          "description": "The version of the application agent running on this node.",
          "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+.*$"
        },
        "machineAgentVersion": {
          "type": "string",
          "description": "The version of the machine agent running on the host."
        },
        "ipAddresses": {
          "type": "object",
          "description": "The IP addresses associated with this node."
        }
      }
    },
    "BusinessTransaction": {
      "type": "object",
      "description": "A business transaction representing a distinct request flow through the application.",
      "required": ["id", "name", "entryPointType", "tierId"],
      "properties": {
        "id": {
          "type": "integer",
          "description": "The internal numeric identifier for the business transaction."
        },
        "name": {
          "type": "string",
          "description": "The name of the business transaction.",
          "minLength": 1,
          "maxLength": 255
        },
        "entryPointType": {
          "type": "string",
          "description": "The entry point type for the transaction.",
          "enum": [
            "SERVLET",
            "HTTP",
            "WEB_SERVICE",
            "POJO",
            "EJB",
            "JMS",
            "SPRING_BEAN",
            "BINARY_REMOTING",
            "ASP_DOTNET",
            "NODEJS_WEB",
            "PHP_WEB",
            "PYTHON_WEB"
          ]
        },
        "internalName": {
          "type": "string",
          "description": "The internal unique name of the transaction."
        },
        "tierId": {
          "type": "integer",
          "description": "The numeric ID of the tier where the transaction entry point is detected."
        },
        "tierName": {
          "type": "string",
          "description": "The name of the tier where the transaction entry point is detected."
        },
        "background": {
          "type": "boolean",
          "description": "Indicates whether this is a background transaction.",
          "default": false
        }
      }
    },
    "Backend": {
      "type": "object",
      "description": "A backend component representing an external dependency detected by the Controller.",
      "required": ["id", "name", "exitPointType"],
      "properties": {
        "id": {
          "type": "integer",
          "description": "The internal numeric identifier for the backend."
        },
        "name": {
          "type": "string",
          "description": "The name of the backend component.",
          "minLength": 1
        },
        "exitPointType": {
          "type": "string",
          "description": "The exit point type for the backend.",
          "enum": [
            "HTTP",
            "JDBC",
            "JMS",
            "CACHE",
            "RABBITMQ",
            "MONGODB",
            "CASSANDRA",
            "WEB_SERVICE",
            "CUSTOM"
          ]
        },
        "properties": {
          "type": "array",
          "description": "Name-value properties describing the backend connection.",
          "items": {
            "type": "object",
            "properties": {
              "name": {
                "type": "string",
                "description": "The property name."
              },
              "value": {
                "type": "string",
                "description": "The property value."
              }
            }
          }
        }
      }
    },
    "MetricValue": {
      "type": "object",
      "description": "A single metric data point with statistical values for a time period.",
      "properties": {
        "startTimeInMillis": {
          "type": "integer",
          "description": "The start time in Unix epoch milliseconds.",
          "minimum": 0
        },
        "occurrences": {
          "type": "integer",
          "description": "The number of observations in this time period.",
          "minimum": 0
        },
        "current": {
          "type": "integer",
          "description": "The current or last observed value."
        },
        "min": {
          "type": "integer",
          "description": "The minimum value observed."
        },
        "max": {
          "type": "integer",
          "description": "The maximum value observed."
        },
        "count": {
          "type": "integer",
          "description": "The total count of observations.",
          "minimum": 0
        },
        "sum": {
          "type": "integer",
          "description": "The sum of all values in this time period."
        },
        "value": {
          "type": "integer",
          "description": "The computed value based on the rollup type."
        },
        "standardDeviation": {
          "type": "number",
          "description": "The standard deviation of values."
        }
      }
    }
  },
  "properties": {
    "applications": {
      "type": "array",
      "description": "The list of monitored business applications.",
      "items": {
        "$ref": "#/$defs/Application"
      }
    },
    "tiers": {
      "type": "array",
      "description": "The list of tiers within the application.",
      "items": {
        "$ref": "#/$defs/Tier"
      }
    },
    "nodes": {
      "type": "array",
      "description": "The list of nodes within the application.",
      "items": {
        "$ref": "#/$defs/Node"
      }
    },
    "businessTransactions": {
      "type": "array",
      "description": "The list of business transactions detected in the application.",
      "items": {
        "$ref": "#/$defs/BusinessTransaction"
      }
    },
    "backends": {
      "type": "array",
      "description": "The list of backend components detected in the application.",
      "items": {
        "$ref": "#/$defs/Backend"
      }
    }
  }
}