Mark check raw file injection as @flaky on Zulu 8 (#11375)

Mark check raw file injection as @flaky on Zulu 8

The smoketest fails ~0.25% of the time on Zulu 8 with
`logLines.size() == 7` (got 3) — root cause is a JDK 8 race between
java.util.logging.LogManager.<clinit> and ClassLoader.initSystemClassLoader()
when a JFR-instrumented class (Zulu 8 backports JFR) loads JUL during
agent premain. The Agent.java waitForJUL guard mitigates most cases but
leaks ~0.25%. The same failure mode already justifies @flaky on Oracle
JDK 8 (same JFR backport) and IBM 8 (IBMSASL triggers the same race);
Zulu 8 belongs alongside them.

This adds JavaVirtualMachine.isZulu8() + a test + extends the @flaky
condition. No production code path changes — Zulu 8 users on a custom
LogManager (e.g. Log4j2 JUL bridge) are still potentially affected by
the underlying agent race; this only suppresses the flaky CI signal.

Match isIbm8 ordering: vendor check first, drop redundant javadoc

ci: retrigger (muzzle Maven mirror flakes)

Merge branch 'master' into brian.marks/flaky-zulu8-log-injection

Co-authored-by: devflow.devflow-routing-intake <devflow.devflow-routing-intake@kubernetes.us1.ddbuild.io>

Author: bm1549

components/environment/src/main/java/datadog/environment/JavaVirtualMachine.java

@@ -116,6 +116,10 @@ public static boolean isIbm8() {
     return isIbm() && isJavaVersion(8);
   }
 
+  public static boolean isZulu8() {
+    return runtime.vendor.contains("Azul") && isJavaVersion(8);
+  }
+
   public static boolean isGraalVM() {
     return runtime.vendorVersion.toLowerCase().contains("graalvm");
   }

components/environment/src/test/java/datadog/environment/JavaVirtualMachineTest.java

@@ -138,6 +138,16 @@ void onlyOnOracleJDK8() {
     assertTrue(JavaVirtualMachine.isOracleJDK8());
   }
 
+  @Test
+  @EnabledIfSystemProperty(named = "java.vm.vendor", matches = ".*Azul.*")
+  @EnabledOnJre(JAVA_8)
+  void onlyOnZulu8() {
+    assertFalse(JavaVirtualMachine.isGraalVM());
+    assertFalse(JavaVirtualMachine.isIbm8());
+    assertFalse(JavaVirtualMachine.isOracleJDK8());
+    assertTrue(JavaVirtualMachine.isZulu8());
+  }
+
   @ParameterizedTest
   @CsvSource(
       value = {

dd-smoke-tests/log-injection/src/test/groovy/datadog/smoketest/LogInjectionSmokeTest.groovy

@@ -416,7 +416,7 @@ abstract class LogInjectionSmokeTest extends AbstractSmokeTest {
     return unmangled.split(" ")[1..2]
   }
 
-  @Flaky(condition = () -> JavaVirtualMachine.isIbm8() || JavaVirtualMachine.isOracleJDK8())
+  @Flaky(condition = () -> JavaVirtualMachine.isIbm8() || JavaVirtualMachine.isOracleJDK8() || JavaVirtualMachine.isZulu8())
   def "check raw file injection"() {
     when:
     def count = waitForTraceCountAlive(2)