feat: Add Nagios XI Provider

[Harmatta]

/claim #3960

Proposed Changes

Adds a new Nagios XI provider for monitoring integration. This provider enables Keep to pull alerts from Nagios XI and receive webhook notifications.

Features

• Pull alerts: Queries the Nagios XI REST API for service problems (WARNING/CRITICAL/UNKNOWN) and host problems (DOWN/UNREACHABLE)
• Push alerts (webhook): Accepts webhook payloads from Nagios notification commands, supporting both host and service alert formats
• Acknowledge problems: Supports acknowledging host and service problems via the Nagios XI command API
• Severity mapping: Maps Nagios states (OK/WARNING/CRITICAL/UNKNOWN for services; UP/DOWN/UNREACHABLE for hosts) to Keep severity levels
• Status mapping: Handles acknowledged, firing, and resolved states
• SSL verification toggle: Supports self-signed certificates

Files Added

• keep/providers/nagios_provider/nagios_provider.py — Main provider implementation
• keep/providers/nagios_provider/alerts_mock.py — Mock alert data for testing
• keep/providers/nagios_provider/README.md — Documentation with setup instructions
• keep/providers/nagios_provider/__init__.py

Architecture

The provider follows the established Keep provider pattern:

• Extends BaseProvider with NagiosProviderAuthConfig for authentication
• Implements _get_alerts() for pull-based alert ingestion
• Implements _format_alert() static method for webhook-based push ingestion
• Implements validate_scopes() for API connectivity verification
• Uses ProviderScope and ProviderMethod for capability declaration

Provider Category

• Category: Monitoring
• Tags: alert

Proof

The provider follows the exact same pattern as existing monitoring providers (Zabbix, Checkmk). Key design decisions:

• Uses Nagios XI REST API v1 (/api/v1/objects/servicestatus, /api/v1/objects/hoststatus)
• API key authentication via query parameter (standard Nagios XI pattern)
• Acknowledges problems via /api/v1/system/command endpoint
• Webhook format is flexible, accepting both Nagios macro variables and custom JSON payloads

Checklist

• PR created against main branch
• Follows existing provider patterns (Zabbix, Checkmk)
• Documentation added (README.md)
• Mock alerts provided for testing

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