Prometheus Metrics

Borg UI can expose Prometheus metrics at:

/metrics

Metrics are disabled by default.

Enable Metrics

Open Settings > System > Metrics Access.

Recommended settings:

• enable /metrics
• require a token
• keep the endpoint on a private network
• expose Grafana, not Borg UI metrics, to users

When token protection is enabled, Borg UI accepts either header:

X-Borg-Metrics-Token: <token>
Authorization: Bearer <token>

If metrics are disabled, /metrics returns 404.

Prometheus Example

scrape_configs:
  - job_name: borg-ui
    metrics_path: /metrics
    static_configs:
      - targets:
          - borg-web-ui:8081
    authorization:
      type: Bearer
      credentials: <your-generated-token>

Or:

scrape_configs:
  - job_name: borg-ui
    metrics_path: /metrics
    static_configs:
      - targets:
          - borg-web-ui:8081
    http_headers:
      X-Borg-Metrics-Token:
        values:
          - <your-generated-token>

Example Monitoring Stack

The repository includes an example stack:

• examples/monitoring/docker-compose.yml
• examples/monitoring/prometheus.yml
• examples/monitoring/grafana/provisioning/datasources/prometheus.yml
• examples/monitoring/grafana/provisioning/dashboards/dashboards.yml
• examples/monitoring/grafana/provisioning/dashboards/json/borg-ui-overview.json
• examples/monitoring/grafana/provisioning/dashboards/json/borg-ui-jobs.json

Metric Groups

Repository metrics:

• borg_repository_info
• borg_repository_size_bytes
• borg_repository_archive_count
• borg_repository_last_backup_timestamp
• borg_repository_last_check_timestamp
• borg_repository_last_compact_timestamp

Backup metrics:

• borg_backup_jobs_total
• borg_backup_orphaned_jobs_total (always empty since the job tables collapsed into operations; kept so existing dashboards keep parsing)
• borg_backup_last_job_success
• borg_backup_last_duration_seconds
• borg_backup_last_original_size_bytes
• borg_backup_last_deduplicated_size_bytes

Restore metrics:

• borg_restore_jobs_total

Maintenance metrics:

• borg_check_jobs_total
• borg_check_last_duration_seconds
• borg_compact_jobs_total
• borg_compact_last_duration_seconds
• borg_prune_jobs_total

System metrics:

• borg_ui_repositories_total
• borg_ui_scheduled_jobs_total
• borg_ui_scheduled_jobs_enabled
• borg_ui_active_jobs

Useful Queries

Last backup failed:

borg_backup_last_job_success{repository="my-repo"} == 0

Time since last backup:

time() - borg_repository_last_backup_timestamp{repository="my-repo"}

Current failed backup job count:

sum(borg_backup_jobs_total{status="failed"}) by (repository)

Troubleshooting

Empty metrics

Run at least one backup, restore, check, prune, or compact job. Some metrics are created only after data exists.

404

Metrics are disabled.

401 or 403

Token protection is enabled and the request did not include a valid token.