Update default system tests commit

Author: nikita-tkachenko-datadog

.circleci/config.continue.yml.j2

@@ -36,7 +36,7 @@ instrumentation_modules: &instrumentation_modules "dd-java-agent/instrumentation
 debugger_modules: &debugger_modules "dd-java-agent/agent-debugger|dd-java-agent/agent-bootstrap|dd-java-agent/agent-builder|internal-api|communication|dd-trace-core"
 profiling_modules: &profiling_modules "dd-java-agent/agent-profiling"
 
-default_system_tests_commit: &default_system_tests_commit 2799fa982318da14c9d3e5f722abdc670d2802c3
+default_system_tests_commit: &default_system_tests_commit 761b9e7a82ffb136c4653a4d1623d120d67b005b
 
 parameters:
   nightly:
@@ -932,7 +932,7 @@ jobs:
           command: |
             cd system-tests
             DD_SITE=datadoghq.com DD_API_KEY=$SYSTEM_TESTS_E2E_DD_API_KEY DD_APPLICATION_KEY=$SYSTEM_TESTS_E2E_DD_APP_KEY ./run.sh INTEGRATIONS
-        
+
       - run:
           name: Run IDM Crossed Tracing Libraries propagation tests for messaging
           environment:
@@ -975,7 +975,7 @@ jobs:
           no_output_timeout: 5m
           command: |
             cd system-tests
-            export DD_API_KEY=$SYSTEM_TESTS_E2E_DD_API_KEY 
+            export DD_API_KEY=$SYSTEM_TESTS_E2E_DD_API_KEY
             ./run.sh DEBUGGER_SCENARIOS
 
       - run:

dd-java-agent/instrumentation/scalatest/src/main/java/datadog/trace/instrumentation/scalatest/ScalatestForkInstrumentation.java

@@ -55,6 +55,12 @@ public void methodAdvice(MethodTransformer transformer) {
    * the tests) and not the parent one. The way to distinguish between the two is by examining the
    * "remoteArgs" passed to the runner method: the args are non-empty in the child process, and
    * empty in the parent one.
+   *
+   * <p>The instrumentation works by increasing the Reporter.class counter in the call depth thread
+   * local map. The counter is decreased when the runner method exits.
+   *
+   * <p>Since the tracing instrumentation is checking the counter value to avoid nested calls,
+   * increasing it here results in effectively disabling the tracing.
    */
   public static class RunnerAdvice {
     @Advice.OnMethodEnter