poorbarcode opened a new pull request, #17704:
URL: https://github.com/apache/pulsar/pull/17704
### Motivation
If `label_cluster` specified `cluster_123`, the expected metrics text is:
```
metrics_xxx_total{cluster="cluster_123"} 1.0
```
but the exactly metrics text is :
```
metrics_xxx_totalcluster="cluster_123"} 1.0
```
### Modifications
Make metrics text generate correct
### Documentation
- [ ] `doc-required`
- [ ] `doc-not-needed`
- [ ] `doc`
- [ ] `doc-complete`
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