{
  "openapi": "3.0.3",
  "info": {
    "title": "Dropwizard Admin API",
    "description": "REST API provided by the Dropwizard admin servlet, exposing health checks, metrics, thread dumps, and operational tasks on the admin port.",
    "version": "4.0.0",
    "contact": {
      "name": "Dropwizard",
      "url": "https://www.dropwizard.io/"
    },
    "license": {
      "name": "Apache 2.0",
      "url": "https://www.apache.org/licenses/LICENSE-2.0"
    }
  },
  "servers": [
    {
      "url": "http://localhost:8081",
      "description": "Default Dropwizard admin port"
    }
  ],
  "paths": {
    "/healthcheck": {
      "get": {
        "operationId": "getHealthChecks",
        "summary": "Run all health checks",
        "description": "Executes all registered health checks and returns their results. Returns 200 if all pass, 500 if any fail.",
        "tags": ["Health"],
        "responses": {
          "200": {
            "description": "All health checks passing.",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "additionalProperties": {
                    "$ref": "#/components/schemas/HealthCheckResult"
                  }
                }
              }
            }
          },
          "500": {
            "description": "One or more health checks failing.",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "additionalProperties": {
                    "$ref": "#/components/schemas/HealthCheckResult"
                  }
                }
              }
            }
          }
        }
      }
    },
    "/metrics": {
      "get": {
        "operationId": "getMetrics",
        "summary": "Get all metrics",
        "description": "Returns all registered application metrics including gauges, counters, histograms, meters, and timers.",
        "tags": ["Metrics"],
        "parameters": [
          {
            "name": "pretty",
            "in": "query",
            "description": "Pretty-print the JSON output.",
            "schema": {
              "type": "boolean",
              "default": false
            }
          }
        ],
        "responses": {
          "200": {
            "description": "All metrics.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Metrics"
                }
              }
            }
          }
        }
      }
    },
    "/threads": {
      "get": {
        "operationId": "getThreadDump",
        "summary": "Get thread dump",
        "description": "Returns a thread dump of all running threads in the JVM.",
        "tags": ["Diagnostics"],
        "responses": {
          "200": {
            "description": "Thread dump output.",
            "content": {
              "text/plain": {
                "schema": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    },
    "/ping": {
      "get": {
        "operationId": "ping",
        "summary": "Ping the application",
        "description": "Simple liveness check that returns pong.",
        "tags": ["Health"],
        "responses": {
          "200": {
            "description": "Application is alive.",
            "content": {
              "text/plain": {
                "schema": {
                  "type": "string",
                  "example": "pong"
                }
              }
            }
          }
        }
      }
    },
    "/tasks/{taskName}": {
      "post": {
        "operationId": "executeTask",
        "summary": "Execute an admin task",
        "description": "Executes a registered admin task by name. Built-in tasks include gc (garbage collection) and log-level.",
        "tags": ["Tasks"],
        "parameters": [
          {
            "name": "taskName",
            "in": "path",
            "required": true,
            "description": "Name of the task to execute.",
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Task executed successfully.",
            "content": {
              "text/plain": {
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "404": {
            "description": "Task not found."
          }
        }
      }
    },
    "/tasks/log-level": {
      "post": {
        "operationId": "changeLogLevel",
        "summary": "Change log level at runtime",
        "description": "Changes the log level for a specific logger at runtime.",
        "tags": ["Tasks"],
        "parameters": [
          {
            "name": "logger",
            "in": "query",
            "required": true,
            "description": "Logger name to change.",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "level",
            "in": "query",
            "required": true,
            "description": "New log level.",
            "schema": {
              "type": "string",
              "enum": ["TRACE", "DEBUG", "INFO", "WARN", "ERROR", "OFF"]
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Log level changed successfully."
          }
        }
      }
    },
    "/tasks/gc": {
      "post": {
        "operationId": "runGarbageCollection",
        "summary": "Trigger garbage collection",
        "description": "Triggers a JVM garbage collection.",
        "tags": ["Tasks"],
        "responses": {
          "200": {
            "description": "Garbage collection triggered."
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "HealthCheckResult": {
        "type": "object",
        "properties": {
          "healthy": {
            "type": "boolean",
            "description": "Whether this health check is passing."
          },
          "message": {
            "type": "string",
            "description": "Optional message from the health check."
          },
          "duration": {
            "type": "integer",
            "description": "Time taken in milliseconds."
          },
          "timestamp": {
            "type": "string",
            "format": "date-time"
          }
        }
      },
      "Metrics": {
        "type": "object",
        "properties": {
          "version": {
            "type": "string"
          },
          "gauges": {
            "type": "object",
            "additionalProperties": {
              "type": "object",
              "properties": {
                "value": {}
              }
            }
          },
          "counters": {
            "type": "object",
            "additionalProperties": {
              "type": "object",
              "properties": {
                "count": {
                  "type": "integer"
                }
              }
            }
          },
          "histograms": {
            "type": "object",
            "additionalProperties": true
          },
          "meters": {
            "type": "object",
            "additionalProperties": true
          },
          "timers": {
            "type": "object",
            "additionalProperties": true
          }
        }
      }
    }
  },
  "tags": [
    {
      "name": "Health",
      "description": "Health check and liveness endpoints."
    },
    {
      "name": "Metrics",
      "description": "Application metrics endpoints."
    },
    {
      "name": "Diagnostics",
      "description": "JVM diagnostic endpoints."
    },
    {
      "name": "Tasks",
      "description": "Administrative task execution endpoints."
    }
  ]
}