[Bug]: master branch, milvus server side monitoring is not continuous

[elstic]

Is there an existing issue for this?

• [X] I have searched the existing issues

Environment

- Milvus version:master-20230410-03a4f60b
- Deployment mode(standalone or cluster):
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

Milvus individual components Memory usage monitoring is discontinuous.

Current Monitoring ：

Expected：

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[LoveEachDay]

In recent version, we've added knowhere metrics for /metrics endpoint. For now there's an error when fetching metrics:

An error has occurred while serving metrics:

text format parsing error in line 1: invalid metric name

@cydrain We'd ignore metrics returned from CRegistry.

[LoveEachDay]

/assign @elstic /unassign

[elstic]

This issue has been verified and fixed .