Add is_crash tag to crash report

Author: gyuheon0h

dd-java-agent/agent-crashtracking/src/main/java/datadog/crashtracking/CrashUploader.java

@@ -153,6 +153,7 @@ public CrashUploader(@Nonnull final ConfigManager.StoredConfig storedConfig) {
     if (!tagsBuilder.toString().isEmpty()) {
       tagsBuilder.append(",");
     }
+    tagsBuilder.append("is_crash:true").append(',');
     tagsBuilder.append(VersionInfo.LIBRARY_VERSION_TAG).append('=').append(VersionInfo.VERSION);
     // PID can be empty if we cannot find it out from the system
     if (!PidHelper.getPid().isEmpty()) {
@@ -446,7 +447,7 @@ private RequestBody makeTelemetryRequestBody(@Nonnull String payload, boolean is
           writer.name("tags").value(tagsForPing(storedConfig.reportUUID));
         } else {
           writer.name("level").value("ERROR");
-          writer.name("tags").value("severity:crash");
+          writer.name("tags").value("severity:crash,is_crash:true");
           writer.name("is_sensitive").value(true);
           writer.name("is_crash").value(true);
         }

dd-java-agent/agent-crashtracking/src/test/java/datadog/crashtracking/CrashUploaderTest.java

@@ -103,6 +103,7 @@ public void testLogsHappyPath() throws Exception {
     assertEquals(SERVICE, event.get("service").asText());
     assertEquals(CRASH, event.get("message").asText());
     assertEquals("ERROR", event.get("level").asText());
+    assertTrue(event.get("ddtags").asText().contains("is_crash:true"));
   }
 
   @Test
@@ -124,6 +125,7 @@ public void testExtractStackTraceFromRealCrashFile() throws IOException {
     assertEquals(
         readFileAsString("sample-stacktrace.txt"), event.get("error").get("stack").asText());
     assertEquals("ERROR", event.get("level").asText());
+    assertTrue(event.get("ddtags").asText().contains("is_crash:true"));
   }
 
   private String readFileAsString(String resource) throws IOException {
@@ -297,7 +299,7 @@ public void testTelemetryHappyPath(String log) throws Exception {
     assertThatJson(extracted.toJson())
         .whenIgnoringPaths("os_info", "metadata", "experimental")
         .isEqualTo(expected.toJson());
-    assertEquals("severity:crash", event.get("payload").get(0).get("tags").asText());
+    assertEquals("severity:crash,is_crash:true", event.get("payload").get(0).get("tags").asText());
     assertCommonPayload(event);
   }