Summary

Adds a new Nagios provider for Keep, supporting both webhook-based alert ingestion and pull-based monitoring via the Nagios XI REST API.

Closes #3960

/claim #3960

Webhook Mode (Nagios Core + XI)

Accepts HTTP POST notifications from Nagios Core and Nagios XI using curl-based notification commands.

Supported notification types:

• PROBLEM / RECOVERY — service/host state changes
• ACKNOWLEDGEMENT — acknowledged alerts
• DOWNTIMESTART / DOWNTIMEEND / DOWNTIMECANCELLED — scheduled downtime
• FLAPPINGSTART / FLAPPINGSTOP / FLAPPINGDISABLED — flapping detection

State/severity mapping:

Includes detailed webhook setup documentation with ready-to-use Nagios notification command definitions.

Pull Mode (Nagios XI only)

Optionally fetches current problems from the Nagios XI REST API:

• Service problems (WARNING, CRITICAL, UNKNOWN states)
• Host problems (DOWN, UNREACHABLE states)
• Requires
  agios_url\ and \pi_key\ in provider config

Files

• \keep/providers/nagios_provider/init.py\
• \keep/providers/nagios_provider/nagios_provider.py\ — main provider
• \keep/providers/nagios_provider/alerts_mock.py\ — mock alert for simulate_alert
• \ ests/test_nagios_provider.py\ — unit tests (11 test cases)

Testing

Unit tests cover:

• Service PROBLEM/RECOVERY formatting
• Host DOWN/RECOVERY formatting
• ACKNOWLEDGEMENT handling
• DOWNTIME (SUPPRESSED status)
• WARNING severity mapping
• Long output concatenation
• Fingerprint fields and provider metadata