Closes #5648

Summary

• Adds a new Nagios provider integration for the Keep alerting platform
• Supports pull-based alert fetching via the Nagios XI REST API (/api/v1/objects/hoststatus and /api/v1/objects/servicestatus)
• Supports push-based webhook notifications from Nagios (with webhook setup instructions)
• Maps Nagios host states (UP/DOWN/UNREACHABLE) and service states (OK/WARNING/CRITICAL/UNKNOWN) to Keep’s AlertStatus and AlertSeverity
• Includes provider icon, documentation page, and mint.json navigation entry

Details

Files Added/Modified

• keep/providers/nagios_provider/nagios_provider.py - Main provider implementation
• keep/providers/nagios_provider/__init__.py - Package init
• keep/providers/nagios_provider/alerts_mock.py - Alert mock data for testing
• keep-ui/public/icons/nagios-icon.png - Provider icon (200x200 PNG)
• docs/providers/documentation/nagios-provider.mdx - Provider documentation
• docs/mint.json - Added nagios-provider to docs navigation

Nagios API Integration

• Authentication: Nagios XI API Key (found in Admin > Manage API Keys)
• Host Status: Fetches via GET /api/v1/objects/hoststatus?apikey=<KEY>
• Service Status: Fetches via GET /api/v1/objects/servicestatus?apikey=<KEY>
• Webhook: Configurable curl-based notification command for push-based alerting

Provider Features

• PROVIDER_CATEGORY: Monitoring
• PROVIDER_TAGS: alert
• Scope validation via API connectivity test
• SSL certificate verification toggle
• Acknowledged problem detection

/claim #3960

Test plan

• Verify provider loads correctly in the Keep platform
• Test pull-based alert fetching against a Nagios XI instance
• Test webhook-based alert ingestion
• Verify severity and status mappings are correct
• Confirm provider icon displays in the UI
• Validate documentation renders correctly

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