Add additional debug logging related to JPS (#8718)

Author: Matt

.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 b0b2e1f212f8c483b52aa3adc6ffd4132b1ba9b8
+default_system_tests_commit: &default_system_tests_commit 9049791de92dcb72b104e99a80f6f9914c1b96fb
 
 parameters:
   nightly:

internal-api/internal-api-9/src/main/java/datadog/trace/util/JPMSJPSAccess.java

@@ -1,11 +1,18 @@
 package datadog.trace.util;
 
+import static datadog.trace.api.telemetry.LogCollector.SEND_TELEMETRY;
+
+import datadog.trace.api.Platform;
 import java.lang.instrument.Instrumentation;
 import java.util.Collections;
 import java.util.Map;
 import java.util.Set;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class JPMSJPSAccess {
+  private static Logger log = LoggerFactory.getLogger(JPMSJPSAccess.class);
+
   public static void patchModuleAccess(Instrumentation inst) {
     Module unnamedModule = ClassLoader.getSystemClassLoader().getUnnamedModule();
     Module jvmstatModule = ModuleLayer.boot().findModule("jdk.internal.jvmstat").orElse(null);
@@ -21,6 +28,13 @@ public static void patchModuleAccess(Instrumentation inst) {
           extraOpens,
           Collections.emptySet(),
           Collections.emptyMap());
+    } else {
+      log.debug(
+          SEND_TELEMETRY,
+          "Failed to find the jdk.internal.jvmstat module, skipping patching of module access on "
+              + Platform.getRuntimeVersion()
+              + " "
+              + Platform.getRuntimeVendor());
     }
   }
 }