Spring Batch 5.1 Metrics API

openapi: 3.1.0
info:
  title: Spring Batch 5.1 Actuator Batch Jobs Metrics API
  description: Spring Boot Actuator endpoints exposed by Spring Batch 5.1 applications for monitoring and managing batch jobs. Provides health checks, metrics, job execution status, and step execution details via the Spring Boot Actuator infrastructure. These endpoints are available when spring-boot-actuator is on the classpath alongside spring-batch-core.
  version: 5.1.0
  contact:
    name: Spring Team
    url: https://spring.io/team
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:8080/actuator
  description: Local Spring Boot application with Actuator enabled
tags:
- name: Metrics
  description: Micrometer-based application metrics
paths:
  /metrics:
    get:
      operationId: listMetrics
      summary: List Available Metrics
      description: Returns a list of all available metric names collected by Micrometer, including Spring Batch job and step metrics.
      tags:
      - Metrics
      responses:
        '200':
          description: List of available metrics
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MetricsList'
  /metrics/{metricName}:
    get:
      operationId: getMetric
      summary: Get Metric Value
      description: Returns measurements for a specific metric. Spring Batch 5.1 exposes metrics under the spring.batch namespace including job duration, step duration, read count, write count, and skip count.
      tags:
      - Metrics
      parameters:
      - name: metricName
        in: path
        required: true
        description: Name of the metric (e.g., spring.batch.job.duration, spring.batch.step.duration, spring.batch.chunk.size)
        schema:
          type: string
          example: spring.batch.job.duration
      - name: tag
        in: query
        required: false
        description: Tag filter in the form name:value (can be repeated)
        schema:
          type: string
          example: job.name:importUserJob
      responses:
        '200':
          description: Metric measurements
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MetricDetail'
        '404':
          description: Metric not found
components:
  schemas:
    MetricDetail:
      type: object
      description: Detail for a specific metric
      properties:
        name:
          type: string
          description: Metric name
        description:
          type: string
          description: Human-readable metric description
        baseUnit:
          type: string
          description: Base measurement unit
        measurements:
          type: array
          description: Metric measurements
          items:
            type: object
            properties:
              statistic:
                type: string
                description: Statistic type (COUNT, TOTAL, MAX, VALUE)
              value:
                type: number
                description: Measurement value
        availableTags:
          type: array
          description: Available tag dimensions for filtering
          items:
            type: object
            properties:
              tag:
                type: string
              values:
                type: array
                items:
                  type: string
    MetricsList:
      type: object
      description: List of available metric names
      properties:
        names:
          type: array
          description: Available metric names
          items:
            type: string
          example:
          - spring.batch.job.duration
          - spring.batch.step.duration
          - spring.batch.chunk.size
          - spring.batch.item.read
          - spring.batch.item.write