more doc for Per-request logging

[wingyiu]

[codecov-io]

Codecov Report

Merging #3896 into master will decrease coverage by 0.06%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3896      +/-   ##
==========================================
- Coverage   40.78%   40.71%   -0.07%     
==========================================
  Files        2943     2200     -743     
  Lines       88364    71460   -16904     
  Branches    11622     9841    -1781     
==========================================
- Hits        36037    29096    -6941     
+ Misses      49209    39606    -9603     
+ Partials     3118     2758     -360

Impacted Files	Coverage Δ
.../context/compress/SpanEventSequenceComparator.java	0% <0%> (-100%)	:arrow_down:
...oint/collector/cluster/AbstractClusterService.java	0% <0%> (-100%)	:arrow_down:
...rap/resolver/condition/ClassResourceCondition.java	0% <0%> (-92.31%)	:arrow_down:
.../connection/CollectorClusterConnectionFactory.java	0% <0%> (-85.72%)	:arrow_down:
...mon/server/util/ThreadPoolExecutorFactoryBean.java	0% <0%> (-85.72%)	:arrow_down:
...thrift/io/CommandHeaderTBaseSerializerFactory.java	0% <0%> (-84.62%)	:arrow_down:
...nt/common/hbase/HbaseConfigurationFactoryBean.java	0% <0%> (-80%)	:arrow_down:
...corp/pinpoint/plugin/dubbo/DubboConfiguration.java	0% <0%> (-77.78%)	:arrow_down:
...rift/io/CommandHeaderTBaseDeserializerFactory.java	0% <0%> (-77.78%)	:arrow_down:
...corp/pinpoint/bootstrap/config/HttpDumpConfig.java	0% <0%> (-70.38%)	:arrow_down:
... and 1812 more

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