openapi: 3.1.0
info:
  title: Prometheus Alertmanager Admin Lifecycle API
  description: The Prometheus Alertmanager HTTP API v2 provides endpoints for querying active alert status, creating and managing silences, retrieving receiver configurations, and checking cluster peer status. Alertmanager deduplicates, groups, and routes alert notifications to receivers such as email, PagerDuty, Slack, and OpsGenie. The API base path is /api/v2.
  version: v0.28.0
  contact:
    name: Prometheus Project
    url: https://prometheus.io/community/
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://{host}:{port}
  description: Alertmanager server
  variables:
    host:
      default: localhost
      description: Alertmanager server hostname
    port:
      default: '9093'
      description: Alertmanager server port
tags:
- name: Lifecycle
  description: Endpoints for managing the Prometheus server lifecycle including configuration reloads and graceful shutdown. Requires --web.enable-lifecycle flag.
paths:
  /-/reload:
    post:
      operationId: reloadConfig
      summary: Prometheus Reload configuration
      description: Triggers a reload of the Prometheus configuration file and rule files. Returns 200 when the reload is successful and 500 if the reload fails. Requires --web.enable-lifecycle flag. Also triggered by sending SIGHUP to the Prometheus process.
      tags:
      - Lifecycle
      responses:
        '200':
          description: Configuration reloaded successfully
        '500':
          description: Configuration reload failed
  /-/quit:
    post:
      operationId: quitServer
      summary: Prometheus Graceful shutdown
      description: Triggers a graceful shutdown of the Prometheus server. Returns 200 immediately while the shutdown proceeds asynchronously. Requires --web.enable-lifecycle flag. Also triggered by sending SIGTERM to the Prometheus process.
      tags:
      - Lifecycle
      responses:
        '200':
          description: Shutdown initiated
  /-/healthy:
    get:
      operationId: checkHealth
      summary: Prometheus Health check
      description: Returns 200 when Prometheus is healthy and ready to serve requests. Returns 500 if Prometheus is not ready. Used for Kubernetes liveness probes.
      tags:
      - Lifecycle
      responses:
        '200':
          description: Prometheus is healthy
        '500':
          description: Prometheus is not healthy
  /-/ready:
    get:
      operationId: checkReady
      summary: Prometheus Readiness check
      description: Returns 200 when Prometheus is ready to serve traffic, meaning it has finished startup and is serving queries. Returns 503 if not yet ready. Used for Kubernetes readiness probes.
      tags:
      - Lifecycle
      responses:
        '200':
          description: Prometheus is ready to serve traffic
        '503':
          description: Prometheus is not yet ready
externalDocs:
  description: Alertmanager Documentation
  url: https://prometheus.io/docs/alerting/latest/alertmanager/