Notifiers only return a single error rather than all error.

Author: SoloJacobsCreated Feb 10, 2026Updated Sep 1, 2026

What did you do?

Create a configuration with multiple errors in the same receiver.

What did you expect to see?

All errors.

What did you see instead? Under which circumstances?

❯ ./amtool check-config config/testdata/conf.multi-error.yml Checking 'config/testdata/conf.multi-error.yml' FAILED: one of url or url_file must be configured

System information

No response

Alertmanager version

Alertmanager configuration file

yaml

receivers:
  - name: 'webhook-critical'
    webhook_configs:
      - url: 'http://example.com/api'
        # ERROR 1: send_resolved is a boolean, but a string is provided.
        # The parser hits this and returns an error immediately.
        send_resolved: "yes_please" 

      - url: '' 
        # ERROR 2: The URL is empty (required field). 
        # This error is currently hidden because the process stopped above.
        http_config:
          # ERROR 3: invalid basic_auth (password/password_file are missing).
          basic_auth:
            username: 'admin'

route:
  group_by: ['alertname']
  receiver: 'webhook-critical'

Prometheus version

Prometheus configuration file

yaml

Logs

Source: prometheus/alertmanager

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