{
  "title": "Spring Boot Admin Console Domain Structure",
  "description": "Hierarchical structure of the Spring Boot Admin domain model, showing applications, instances, events, and the Actuator proxy relationship.",
  "structure": {
    "SpringBootAdminServer": {
      "description": "The central Admin server that manages registrations and provides the UI.",
      "components": {
        "ApplicationRegistry": {
          "description": "Logical groupings of instances by application name.",
          "api": "GET /applications",
          "fields": {
            "name": "String — application name (spring.application.name)",
            "instances": "Collection<Instance> — all running instances",
            "status": "ApplicationStatus — aggregate of instance statuses"
          }
        },
        "InstanceRegistry": {
          "description": "Individual registered Spring Boot application instances.",
          "api": "GET /instances",
          "fields": {
            "id": "String — unique Admin-assigned ID",
            "version": "Long — optimistic lock version",
            "registration": "Registration — name, URLs, metadata",
            "registered": "boolean — currently registered flag",
            "statusInfo": "StatusInfo — current health status",
            "statusTimestamp": "Instant — last status change time",
            "info": "Info — data from /actuator/info",
            "endpoints": "List<Endpoint> — available actuator endpoints",
            "buildVersion": "BuildVersion — version from info",
            "tags": "Map<String, String> — custom metadata"
          },
          "children": {
            "Registration": {
              "description": "Data submitted by the application client on startup.",
              "fields": {
                "name": "String — spring.application.name",
                "managementUrl": "URL — base Actuator URL",
                "healthUrl": "URL — /actuator/health URL",
                "serviceUrl": "URL — application root URL",
                "metadata": "Map<String, String> — extra metadata"
              }
            },
            "StatusInfo": {
              "description": "Health status polled from the instance's health endpoint.",
              "fields": {
                "status": "String — UP | DOWN | OUT_OF_SERVICE | UNKNOWN | RESTRICTED | OFFLINE",
                "details": "Map<String, Object> — component health details"
              }
            }
          }
        },
        "InstanceEventStore": {
          "description": "Ordered event log of all instance lifecycle changes.",
          "api": "GET /instances/events (SSE)",
          "eventTypes": {
            "REGISTERED": "New instance registered",
            "DEREGISTERED": "Instance deregistered or expired",
            "STATUS_CHANGED": "Health status changed (e.g., UP → DOWN)",
            "INFO_CHANGED": "Application info updated",
            "ENDPOINTS_DETECTED": "Actuator endpoints discovered or changed"
          }
        },
        "ActuatorProxy": {
          "description": "Proxies requests to managed instance Actuator endpoints.",
          "api": "/instances/{id}/actuator/**",
          "proxiedEndpoints": [
            "health",
            "info",
            "metrics",
            "env",
            "loggers",
            "threaddump",
            "heapdump",
            "scheduledtasks",
            "conditions",
            "configprops",
            "mappings",
            "liquibase",
            "flyway"
          ]
        },
        "NotificationService": {
          "description": "Sends notifications on instance status changes.",
          "channels": [
            "Email (spring-boot-admin-server-notify-mail)",
            "Slack",
            "PagerDuty",
            "OpsGenie",
            "Microsoft Teams",
            "Telegram",
            "Hipchat",
            "Webhooks"
          ]
        }
      }
    }
  }
}