openapi: 3.1.0
info:
  title: PHP-FPM and Endpoints Ping Status API
  description: 'PHP-FPM (FastCGI Process Manager) does not expose a public HTTP API for

    runtime configuration, but it does expose two operational HTTP endpoints

    via the web server that proxies FastCGI requests to PHP-FPM. The status

    endpoint is enabled by setting `pm.status_path` and reports pool

    metrics in plain text, full text, HTML, JSON, XML, or OpenMetrics

    format depending on a query-string flag. The ping endpoint is enabled

    by setting `ping.path` and returns a configurable static response

    (default `pong`) suitable for upstream health checks.


    The actual paths are administrator-defined; the most common

    conventions (`/fpm-status` and `/fpm-ping`) are modeled here. Authentication

    and access control are handled by the fronting web server, not by

    PHP-FPM itself.

    '
  version: 1.0.0
  contact:
    name: PHP-FPM documentation
    url: https://www.php.net/manual/en/install.fpm.php
  license:
    name: PHP License
    url: https://www.php.net/license/
servers:
- url: http://{host}
  description: Web server fronting PHP-FPM.
  variables:
    host:
      default: localhost
      description: Hostname of the web server proxying FastCGI requests.
tags:
- name: Status
  description: PHP-FPM pool status.
paths:
  /fpm-status:
    get:
      tags:
      - Status
      summary: Get PHP-FPM pool status
      description: 'Returns PHP-FPM pool metrics. The output format is selected via a

        query-string flag and may include per-process detail when `full`

        is set. The default response is plain text.

        '
      operationId: getStatus
      parameters:
      - in: query
        name: full
        schema:
          type: string
        allowEmptyValue: true
        description: When present, includes per-process detail.
      - in: query
        name: json
        schema:
          type: string
        allowEmptyValue: true
        description: Return JSON output.
      - in: query
        name: xml
        schema:
          type: string
        allowEmptyValue: true
        description: Return XML output.
      - in: query
        name: html
        schema:
          type: string
        allowEmptyValue: true
        description: Return HTML output.
      - in: query
        name: openmetrics
        schema:
          type: string
        allowEmptyValue: true
        description: Return OpenMetrics output.
      responses:
        '200':
          description: PHP-FPM status.
          content:
            text/plain:
              schema:
                type: string
            application/json:
              schema:
                $ref: '#/components/schemas/PoolStatus'
            application/xml:
              schema:
                type: string
            text/html:
              schema:
                type: string
            application/openmetrics-text:
              schema:
                type: string
components:
  schemas:
    PoolStatus:
      type: object
      properties:
        pool:
          type: string
        process manager:
          type: string
          enum:
          - static
          - dynamic
          - ondemand
        start time:
          type: integer
        start since:
          type: integer
        accepted conn:
          type: integer
        listen queue:
          type: integer
        max listen queue:
          type: integer
        listen queue len:
          type: integer
        idle processes:
          type: integer
        active processes:
          type: integer
        total processes:
          type: integer
        max active processes:
          type: integer
        max children reached:
          type: integer
        slow requests:
          type: integer
externalDocs:
  description: PHP-FPM status page documentation
  url: https://www.php.net/manual/en/fpm.status.php