add flags to enable alert logging level

[waynepeking348]

What type of PR is this?

enhancements

What this PR does / why we need it:

provide the ability to set default logging package level

[codecov]

Codecov Report

Patch coverage: 75.97% and project coverage change: +0.48% 🎉

Comparison is base (20bae0a) 50.25% compared to head (fb7327c) 50.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   50.25%   50.73%   +0.48%     
==========================================
  Files         393      409      +16     
  Lines       37767    38801    +1034     
==========================================
+ Hits        18978    19684     +706     
- Misses      16642    16902     +260     
- Partials     2147     2215      +68     

Flag	Coverage Δ
unittest	50.73% <75.97%> (+0.48%)	⬆️

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

Files Changed	Coverage Δ
pkg/util/machine/util.go	68.65% <25.00%> (+3.65%)	⬆️
pkg/util/general/log.go	58.88% <31.25%> (-6.45%)	⬇️
cmd/base/options/generic.go	47.54% <66.66%> (+0.98%)	⬆️
pkg/metaserver/agent/metric/helper/pod.go	68.42% <68.42%> (ø)
...in/qosaware/resource/memory/plugin/memory_guard.go	69.38% <69.38%> (ø)
...advisor/plugin/qosaware/resource/memory/advisor.go	78.91% <70.90%> (+5.70%)	⬆️
pkg/metaserver/agent/metric/helper/system.go	72.30% <72.30%> (ø)
pkg/metaserver/agent/metric/helper/container.go	73.33% <73.33%> (ø)
cmd/base/options/log.go	77.77% <77.77%> (ø)
...in/qosaware/resource/memory/plugin/cache_reaper.go	91.30% <91.30%> (ø)
... and 7 more

... and 63 files with indirect coverage changes

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