ref(crons): Reorganize incident creation / issue occurrence logic

[ShashankFC]

Test 8

Summary by CodeRabbit

Release Notes

• New Features
  • Implemented automatic incident creation and detection for monitor failures, respecting configurable failure thresholds.
  • Enhanced incident context with human-readable failure reason summaries, environment details, and tracking of last successful check-in times to aid in incident diagnosis and resolution.

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Replicated from ai-code-review-evaluation/sentry-coderabbit#8

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Note

Medium Risk
Behavior should be largely preserved but the refactor touches incident creation, environment status transitions, and Kafka occurrence emission, so regressions could affect alerting/issue generation.

Overview
Refactors monitor failure incident handling by moving threshold evaluation and incident lifecycle logic out of mark_failed.py into try_incident_threshold (logic/incidents.py).

Extracts issue-platform occurrence creation into logic/incident_occurrence.py, including monitor context building and human-readable failure-reason generation, and updates mark_failed to delegate to the new flow. Also promotes SimpleCheckIn into monitors/types.py for shared use.

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[ShashankFC]

bugbot run

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Local config copy is never used in return

Medium Severity

In get_monitor_environment_context, a local config copy is created and the schedule_type key is replaced with a human-readable display value, but the return dict on line 168 uses the original monitor_environment.monitor.config instead of the local config variable. The schedule_type transformation is effectively dead code, and the monitor context will always contain the raw schedule_type value instead of the display-friendly one.