[ISSUE #6964] use the correct context in telemetry; polish the code structure

[xdkxlk]

Which Issue(s) This PR Fixes

Fixes #6964

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Merging #6965 (78e21b3) into develop (87075c2) will decrease coverage by 0.05%.
The diff coverage is 18.64%.

@@              Coverage Diff              @@
##             develop    #6965      +/-   ##
=============================================
- Coverage      42.69%   42.65%   -0.05%     
- Complexity      9221     9223       +2     
=============================================
  Files           1131     1131              
  Lines          80485    80495      +10     
  Branches       10520    10517       -3     
=============================================
- Hits           34366    34334      -32     
- Misses         41822    41871      +49     
+ Partials        4297     4290       -7     

Impacted Files	Coverage Δ
...etmq/proxy/grpc/v2/DefaultGrpcMessingActivity.java	0.00% <0.00%> (ø)
...cketmq/proxy/grpc/v2/GrpcMessagingApplication.java	38.91% <0.00%> (ø)
...ache/rocketmq/proxy/processor/ClientProcessor.java	0.00% <ø> (ø)
...tmq/proxy/processor/DefaultMessagingProcessor.java	2.89% <0.00%> (ø)
...e/rocketmq/proxy/processor/MessagingProcessor.java	16.66% <ø> (ø)
...proxy/remoting/activity/ClientManagerActivity.java	0.00% <0.00%> (ø)
...oxy/remoting/activity/ConsumerManagerActivity.java	0.00% <0.00%> (ø)
...proxy/remoting/channel/RemotingChannelManager.java	90.69% <ø> (ø)
...q/remoting/protocol/body/LockBatchRequestBody.java	0.00% <0.00%> (ø)
...remoting/protocol/body/UnlockBatchRequestBody.java	0.00% <0.00%> (ø)
... and 6 more

... and 22 files with indirect coverage changes

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[drpmma]

LGTM