Adding class exclusion from instrumentation config

[eyalkoren]

Adding (and exposing) the ability to exclude classes from instrumentation without having to override the default excluded classes.
For example - https://discuss.elastic.co/t/how-to-ignore-certain-spans/232625

[ghost]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request Adding class exclusion from instrumentation config #1187 updated]

• Start Time: 2020-05-19T09:05:24.530+0000

• Duration: 39 min 2 sec (2342457)

Test stats 🧪

Test	Results
Failed	0
Passed	1322
Skipped	12
Total	1334

[codecov-io]

Codecov Report

Merging #1187 into master will decrease coverage by 4.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1187      +/-   ##
============================================
- Coverage     63.25%   59.20%   -4.05%     
- Complexity     2943     2983      +40     
============================================
  Files           292      338      +46     
  Lines         14489    15918    +1429     
  Branches       2006     2223     +217     
============================================
+ Hits           9165     9425     +260     
- Misses         4696     5845    +1149     
- Partials        628      648      +20     

Impacted Files	Coverage Δ	Complexity Δ
...java/co/elastic/apm/agent/bci/ElasticApmAgent.java	73.85% <100.00%> (+0.09%)	43.00 <0.00> (ø)
...tic/apm/agent/configuration/CoreConfiguration.java	97.28% <100.00%> (+0.07%)	36.00 <1.00> (+1.00)
...nt/configuration/converter/ListValueConverter.java	43.47% <0.00%> (-39.86%)	4.00% <0.00%> (ø%)
...ration/source/PropertyFileConfigurationSource.java	30.26% <0.00%> (-35.46%)	10.00% <0.00%> (ø%)
...tion/source/SystemPropertyConfigurationSource.java	23.07% <0.00%> (-26.93%)	3.00% <0.00%> (ø%)
...c/main/java/co/elastic/apm/agent/util/IOUtils.java	40.19% <0.00%> (-23.87%)	10.00% <0.00%> (ø%)
...ic/apm/opentracing/ExternalProcessSpanContext.java	100.00% <0.00%> (ø)	6.00% <0.00%> (?%)
...h/src/main/java/co/elastic/apm/attach/JvmInfo.java	50.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...ntracing/impl/ElasticApmTracerInstrumentation.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
.../apm/agent/kafka/KafkaProducerInstrumentation.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
... and 45 more

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[felixbarny]

Maybe classes_excluded_from_instrumentation_default so that the prefix is the same? Feel free to ignore though

[codecov-commenter]

Codecov Report

Merging #1187 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1187      +/-   ##
============================================
+ Coverage     59.14%   59.21%   +0.06%     
  Complexity       83       83              
============================================
  Files           338      338              
  Lines         15910    15919       +9     
  Branches       2222     2223       +1     
============================================
+ Hits           9410     9426      +16     
+ Misses         5852     5846       -6     
+ Partials        648      647       -1     

Impacted Files	Coverage Δ	Complexity Δ
...java/co/elastic/apm/agent/bci/ElasticApmAgent.java	73.85% <100.00%> (+0.09%)	0.00 <0.00> (ø)
...tic/apm/agent/configuration/CoreConfiguration.java	97.28% <100.00%> (+0.07%)	0.00 <0.00> (ø)
...ic/apm/agent/profiler/collections/LongHashSet.java	17.46% <0.00%> (-0.80%)	0.00% <0.00%> (ø%)
...tic/apm/agent/report/AbstractIntakeApiHandler.java	77.08% <0.00%> (+5.20%)	0.00% <0.00%> (ø%)
.../bci/bytebuddy/SoftlyReferencingTypePoolCache.java	93.75% <0.00%> (+12.50%)	0.00% <0.00%> (ø%)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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