Update thread dump file name (#3131)

Author: heyams

agent/agent/src/main/java/com/microsoft/applicationinsights/agent/StartupProfiler.java

@@ -17,8 +17,6 @@
 
 final class StartupProfiler {
 
-  private static final String STACKTRACES = "stacktrace.txt";
-
   @SuppressWarnings("SystemOut")
   public static void start() {
     String tempDirectory = System.getProperty("java.io.tmpdir");
@@ -28,7 +26,7 @@ public static void start() {
       return;
     }
 
-    File dumpFile = new File(folder, STACKTRACES);
+    File dumpFile = new File(folder, getThreadDumpFilename());
     System.out.println("Writing startup profiler to '" + dumpFile.getPath() + "'");
 
     PrintWriter printWriter;
@@ -50,6 +48,10 @@ private static void start(PrintWriter out) {
     thread.start();
   }
 
+  private static String getThreadDumpFilename() {
+    return "stacktrace-" + System.currentTimeMillis() + ".txt";
+  }
+
   private static class ThreadDump implements Runnable {
 
     private final PrintWriter out;