unbridled-41 opened a new pull request, #5975:
URL: https://github.com/apache/rocketmq-dashboard/pull/5975
### Which Issue(s) This PR Fixes
Fixes #5974
### Problem / Evidence
```java
// RocketMQMetadataProvider (before)
AtomicReference<GroupLiveSnapshot> snapshot = new
AtomicReference<>(GroupLiveSnapshot.empty());
private static GroupLiveSnapshot empty() { return new
GroupLiveSnapshot(List.of(), 0, false, 0L, 0, false); }
```
`timedOutGroupEnrichmentMustNotMutateReturnedGroupTest` pinned the
fabricated 0 in its two assertions; the same class sets -1 for a failed lookup
and `ConsumerGroupVO` documents -1 as "inventory unavailable".
### Root cause / Fix
"Nothing observed yet" doubled as a measured value. Initialize the snapshot
with the sentinel (renamed `unknown()`); every worker-written snapshot is
unchanged.
### Priority and scoring
**PRIORITY 58** - impact 20/40 (a fabricated measurement that the health
verdict escalates to critical), blast radius 12/20 (groups whose enrichment is
cut short on a busy page), reproducibility 16/20 (pinned by the existing
timeout test), maintenance value 10/20. **FIX_CONFIDENCE 78**.
### Tests
`cd server && mvn -o -B -ntp test -Dtest='RocketMQMetadataProviderTest'` ->
`Tests run: 48, Failures: 0, Errors: 0`;
`-Dtest='MetadataServiceTest,ConsumerGroupControllerTest,RocketMQClientProviderTest'`
-> `Tests run: 125, Failures: 0, Errors: 0`. The timeout test now asserts -1
at both points and fails before the change (`expected: -1 but was: 0`);
`checkstyle:check` passes.
### Risk
Groups whose enrichment is cancelled now report the unknown sentinel (the
web renders 不可用 and the diagnostics raise the "connection status unknown"
warning instead of the critical "no clients with lag" claim).
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