openapi: 3.0.3
info:
  title: Helidon Observe ( & ) Health Metrics API
  description: Helidon provides built-in observability endpoints following the MicroProfile Health and MicroProfile Metrics specifications. These endpoints expose application health status, readiness, liveness, startup checks, and application/vendor/base metrics. In Helidon 4.x, these are served under the /observe path by default.
  version: 4.1.0
  contact:
    name: Helidon Team
    url: https://helidon.io/
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:8080
  description: Default Helidon server
tags:
- name: Metrics
paths:
  /observe/metrics:
    get:
      operationId: getMetrics
      summary: Helidon All metrics
      description: Returns all application, vendor, and base metrics in Prometheus or JSON format
      tags:
      - Metrics
      parameters:
      - name: Accept
        in: header
        schema:
          type: string
          enum:
          - application/json
          - text/plain
        description: Response format (text/plain for Prometheus, application/json for JSON)
      responses:
        '200':
          description: All metrics
          content:
            text/plain:
              schema:
                type: string
                description: Prometheus exposition format
            application/json:
              schema:
                type: object
  /observe/metrics/application:
    get:
      operationId: getApplicationMetrics
      summary: Helidon Application metrics
      description: Returns application-scoped metrics
      tags:
      - Metrics
      responses:
        '200':
          description: Application metrics
          content:
            text/plain:
              schema:
                type: string
            application/json:
              schema:
                type: object
  /observe/metrics/vendor:
    get:
      operationId: getVendorMetrics
      summary: Helidon Vendor metrics
      description: Returns vendor-specific metrics
      tags:
      - Metrics
      responses:
        '200':
          description: Vendor metrics
          content:
            text/plain:
              schema:
                type: string
            application/json:
              schema:
                type: object
  /observe/metrics/base:
    get:
      operationId: getBaseMetrics
      summary: Helidon Base metrics
      description: Returns MicroProfile base metrics (JVM, thread, classloader, etc.)
      tags:
      - Metrics
      responses:
        '200':
          description: Base metrics
          content:
            text/plain:
              schema:
                type: string
            application/json:
              schema:
                type: object