chore(core): clean up

[kptkin]

Description

• Fixes WB-NNNNN
• Fixes #NNNN

What does the PR do?

Include a concise description of the PR contents

Testing

How was this PR tested?

[codecov[bot]]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (3f0150a) 79.68% compared to head (a1aeadd) 79.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6946      +/-   ##
==========================================
- Coverage   79.68%   79.67%   -0.02%     
==========================================
  Files         462      462              
  Lines       52747    52752       +5     
==========================================
- Hits        42033    42028       -5     
- Misses      10416    10426      +10     
  Partials      298      298              

Flag	Coverage Δ
func	48.69% <53.37%> (-0.01%)	:arrow_down:
system	61.96% <77.52%> (-0.05%)	:arrow_down:
unit	59.37% <55.61%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
core/pkg/server/history.go	97.77% <ø> (+0.16%)	:arrow_up:
core/pkg/server/metric.go	73.91% <ø> (+3.54%)	:arrow_up:
core/internal/clients/retry_policy.go	81.57% <42.85%> (-9.60%)	:arrow_down:
core/pkg/server/sender.go	83.16% <92.77%> (-0.16%)	:arrow_down:
core/pkg/server/handler.go	84.49% <91.35%> (+2.05%)	:arrow_up:

... and 7 files with indirect coverage changes