Alerta automatically deletes my alerts after 2 hours

[Jouyn60]

Alerta Issue Report

Issue Summary

Alerta automatically deletes my alerts after 2 hours, without any apparent configuration directing it to do so.

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Environment

• OS: Linux (Red Hat 8)
• API version: Alerta API 9.0.4
• Deployment: Docker
• Database: Postgres
• Auth enabled? No
• Web UI version: 8.7.1

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To Reproduce

1. Create or receive alerts in Alerta.
2. Monitor the alerts for around 2 hours.
3. Notice that the alerts are completely removed from the system after approximately 2 hours.
4. No errors appear, but the alerts vanish nonetheless.

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Docker-Compose File

services:
  web:
    image: alerta/alerta-web
    ports:
      - 8080:8080
    depends_on:
      - db
    environment:
      DATABASE_URL: "postgres://postgres:postgres@db:5432/monitoring"
      AUTH_REQUIRED: "false"
      ADMIN_USERS: "admin@alerta.io,devops@alerta.io"
      ADMIN_PASSWORD: "alerta"
      ADMIN_KEY: "demo-key"
      # -- Alerta Plugins
      PLUGINS: "remote_ip,reject,heartbeat,blackout,normalise,enhance,prometheus"
      # -- Prometheus Plugin
      PROMETHEUS_USE_LABELS: "true"
      ALLOWED_ENVIRONMENTS: "Production,Development,Demo,PreProd,Integration,Unknown"
      DEFAULT_ENVIRONMENT: "Unknown"
      DELETE_EXPIRED_AFTER: 0  # hours
      DELETE_INFO_AFTER: 0     # do not delete informational alerts
      ALERT_TIMEOUT: 0
      SHELVE_TIMEOUT: 0
      DEFAULT_INFORM_SEVERITY: informational
      DEFAULT_EXPIRED_DELETE_HRS: 0   # hours
      DEFAULT_INFO_DELETE_HRS: 0      # hours
    restart: always

  db:
    image: postgres
    volumes:
      - ./pg-data:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: "monitoring"
      POSTGRES_USER: "postgres"
      POSTGRES_PASSWORD: "postgres"
    restart: always

Expected Behavior

I expect the alerts to remain in the system longer than 2 hours (or follow the configured retention period) rather than being automatically deleted without explanation.

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Additional Context

I have checked my Alerta configuration and did not find any settings indicating a 2-hour retention or automatic purge.
No errors or warnings appear in the logs around the time the alerts are removed.
This issue persists across different alert sources and severities
.
Please let me know if you need any more information or specific configuration details to diagnose why Alerta is deleting these alerts prematurely.