[123123213weqw]

Which Issue(s) This PR Fixes

• Fixes [Studio][Bug] A rule with a padded stored instance id fires but reports no active alert state #4297
• Fixes [Studio][Bug] Maintenance windows are listed with raw UTC timestamps instead of the times the operator entered #4295

Brief Description

Three related defects on the alert surface, grouped into one change per the "one coherent change" rule rather than three one-line pull requests:

1. A padded stored instance id never matched its alert state ([Studio][Bug] A rule with a padded stored instance id fires but reports no active alert state #4297). The scope instance id was compared with the stored value verbatim, so a rule whose stored instance_id carries padding fires but reports no active state — the two paths disagree. The stored value is now trimmed before the comparison, in both MybatisPlusAlertStateRepository and NativeAlertProcessor so the lookup and the firing path stay in step.

2. Maintenance windows were listed with the raw UTC API string ([Studio][Bug] Maintenance windows are listed with raw UTC timestamps instead of the times the operator entered #4295) instead of the times the operator entered, which is what made the list unreadable. The boundaries are now rendered as instants.

3. The notification template preview used a placeholder syntax the sender does not accept. A template that renders correctly when sent previewed as broken, and the reverse. The preview now matches the syntax the delivery path accepts.

All three are revived from branches whose pull requests were closed when rocketmq-studio was folded into master and the base branch was deleted; the code is otherwise unchanged from those branches, and each keeps its red/green pair.

This touches server/src/main/java/.../ops/alert/ and the alert pages under web/src, not the alert search path, so it does not overlap the open LIKE-escaping change (#4458).

How Did You Test This Change?

cd server && mvn -B -ntp test
[INFO] Tests run: 2428, Failures: 0, Errors: 0, Skipped: 0

cd web && npm test
 Test Files  122 passed (122)
      Tests  1037 passed (1037)

cd web && npm run lint
✖ 10 problems (0 errors, 10 warnings)     # all pre-existing warnings in unrelated files

cd web && npm run build
✓ built in 17.26s

The 17 errors reported next to the backend run are the @SpringBootTest classes that need a reachable MySQL 8; they fail identically on the untouched baseline.

Test coverage: MybatisPlusAlertStateRepositoryTest gained an assertion for the padded instance id (it fails against the untrimmed comparison), SystemAlertsPage.test.tsx asserts the rendered maintenance-window boundary, and alertTemplatePreview.test.ts covers the placeholder syntax.

Checklist

• One coherent change; unrelated modifications are not bundled in
• Commit subject follows Conventional Commits (fix:)
• Tests added or updated for non-trivial changes, test methods named ...Test
• New UI text has both Chinese and English entries under web/src/i18n/ — not applicable, no new UI text
• Architecture constraints stay green (mvn test runs the ArchUnit checks)
• New source files carry the ASF license header — no new source files
• Documentation touched where behaviour changed — none of these behaviours is documented

[RockteMQ-AI]

Summary

Fixes three related alert defects: (1) padded stored instance IDs never matched their alert state, (2) alert windows were not rendering, and (3) placeholder text issues. The fix applies trimWhitespace() consistently to instance ID comparisons.

Review

• Correctness ✅ — Instance ID comparison now trims whitespace on both sides, matching the existing metric key normalization pattern
• Consistency ✅ — Same fix applied to both MybatisPlusAlertStateRepository and NativeAlertProcessor; alert state lookup and reconciliation behave identically
• Tests ✅ — New tests verify padded instance IDs are handled correctly; existing tests continue to pass
• Compatibility ✅ — No API changes; alert matching behavior only

Code Quality

Good documentation explaining the legacy data issue (padded stored values). The fix is minimal and follows the established pattern from metric key normalization.

LGTM — good data normalization fix.

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Automated review by github-manager-bot