Summary

Add a webhook-based Nagios provider for receiving host and service notifications in Keep.

Changes

• nagios_provider.py: Webhook-only provider following the Checkmk provider pattern
  • Host notifications: UP/DOWN/UNREACHABLE → AlertStatus mapping
  • Service notifications: OK/WARNING/CRITICAL/UNKNOWN → AlertSeverity mapping
  • Fingerprint based on host + service for deduplication
  • _format_alert() handles both host-only and host+service payloads
• alerts_mock.py: Mock fixtures for host_down and service_critical scenarios
• README.md: Setup documentation with Nagios Core/XI command definitions and curl test examples

Webhook Configuration

define command{
  command_name    notify-keep-service
  command_line    /usr/bin/curl -s -X POST \
    -H "Content-Type: application/json" \
    -H "X-API-KEY: \$USER1\$" \
    -d '{"host_name":"\$HOSTNAME\$","service_description":"\$SERVICEDESC\$","service_state":"\$SERVICESTATE\$","service_output":"\$SERVICEOUTPUT\$","notification_type":"\$NOTIFICATIONTYPE\$"}' \
    KEEP_WEBHOOK_URL
}

Testing

curl -X POST http://localhost:8080/alerts/event/nagios \
  -H "Content-Type: application/json" \
  -H "X-API-KEY: your-api-key" \
  -d '{"host_name":"testhost","host_state":"DOWN","host_output":"CRITICAL - Host unreachable","notification_type":"PROBLEM"}'

/claim #3960