btlqql opened a new issue, #1045:
URL: https://github.com/apache/rocketmq-dashboard/issues/1045
## Problem
`RocketMQAdminClientImpl.sendMessage` creates a throwaway producer whose
**producer group name** is derived only from `System.currentTimeMillis()`:
```java
DefaultMQProducer producer = new DefaultMQProducer("studio_msg_sender_" +
System.currentTimeMillis());
```
Concurrent send requests in the same millisecond build the same group name,
so two short-lived producers register under one client identity — the same
collision class that issue caching fixed for consumer/producer *instance names*
(`ShortLivedClientName`), but the group name is still timestamp-only.
## Expected
Short-lived producers use a collision-resistant group name while keeping the
human-readable prefix.
## Acceptance criteria
- `sendMessage` uses a unique producer group name per call (prefix + random
suffix).
- Concurrent sends never share a group identity.
- Existing functionality (send + audit + shutdown) is unchanged.
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