docs(component): add component id monitoring report

docs/component-id-monitoring-report.md

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+---
+date: 2026-06-23
+status: monitoring
+---
+
+# Component ID Monitoring Report
+
+## Summary
+
+We saw a component notification like:
+
+```text
+Component: Embeddings
+Status: unknown -> Operational
+```
+
+Current decision: monitor next incidents/component updates before changing storage behavior.
+
+## Findings
+
+- Component checkpoints are stored in Redis as `component_id -> last_status`.
+- Redis key: `openai-status:component-statuses`.
+- Component names are not stored in that checkpoint hash.
+- Component names come from live OpenAI `summary.json` during each poll.
+- The bot compares component status by `component.ID`, then formats the alert with `component.Name`.
+- Incident `page_id` is not used to detect components.
+- `page_id` identifies the OpenAI status page, not a specific component.
+- `unknown -> Operational` means current component found, but no previous checkpoint existed for that component ID.
+
+## Possible Problem
+
+OpenAI/Statuspage may have changed, recreated, or migrated the component ID.
+
+If component ID changed:
+
+- Bot treats the component as new.
+- Previous status becomes `unknown`.
+- Old Redis component ID remains unused.
+- Component-filtered subscriptions using old ID may stop matching.
+- Unfiltered component subscriptions still receive updates.
+
+Other possible causes:
+
+- Redis checkpoint was cleared or partially lost.
+- `openai-status:initialized` exists while `openai-status:component-statuses` is missing entries.
+- OpenAI added a new component.
+
+## Current State
+
+- No code change now.
+- Monitor upcoming incidents and component updates.
+- Compare current OpenAI component IDs with stored Redis component IDs.
+- Decide later whether ID-only storage is enough.
+
+## Future Options
+
+- Keep ID-based storage if OpenAI component IDs prove stable.
+- Store component name alongside ID for easier debugging.
+- Add name fallback/alias logic if component IDs change in practice.
+- Make component-filtered subscriptions survive ID changes by matching name when ID missing.
+
+## Unresolved Questions
+
+- Did OpenAI actually change the component ID?
+- Are old component IDs present in Redis but absent from current `summary.json`?
+- Should component subscriptions survive ID changes by matching component name?