You cannot merge tasks and triggers, they are different things.
For a trigger you expect having a message "Duplicate trigger id with name ..." There is a `allTriggerIds()` in the Flow class.
Trigger ids should be unique in a flow
### Expected Behavior

_No response_

### Actual Behaviour

See https://kestra-io.slack.com/archives/C03FQKXRK3K/p1693832885758649
Missing a validation on trigger ids

### Steps To Reproduce

_No response_

### Environment Information

- Kestra Version: 0.12.0-SNAPSHOT
- Operating System (OS / Docker / Kubernetes):
- Java Version (If not docker):


### Example flow

_No response_
core/src/main/java/io/kestra/core/validations/ValidationFactory.java
core/src/main/java/io/kestra/core/validations/ValidationFactory.java
core/src/test/java/io/kestra/core/models/flows/FlowTest.java core/src/test/resources/flows/invalids/duplicate.yaml
diff --git a/core/src/main/java/io/kestra/core/validations/ValidationFactory.java b/core/src/main/java/io/kestra/core/validations/ValidationFactory.java
index 33c2b9b99c..57ca63b3f4 100644
--- a/core/src/main/java/io/kestra/core/validations/ValidationFactory.java
+++ b/core/src/main/java/io/kestra/core/validations/ValidationFactory.java
@@ -6,8 +6,8 @@
 import io.kestra.core.models.flows.Input;
 import io.kestra.core.models.tasks.RunnableTask;
 import io.kestra.core.models.tasks.Task;
-import io.kestra.core.tasks.flows.Dag;
 import io.kestra.core.models.tasks.WorkerGroup;
+import io.kestra.core.tasks.flows.Dag;
 import io.kestra.core.tasks.flows.Switch;
 import io.kestra.core.tasks.flows.WorkingDirectory;
 import io.micronaut.context.annotation.Factory;
@@ -17,9 +17,13 @@
 
 import java.io.IOException;
 import java.text.SimpleDateFormat;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
 import java.util.regex.Pattern;
 import java.util.regex.PatternSyntaxException;
+import java.util.stream.Collectors;
 
 @Factory
 public class ValidationFactory {
@@ -183,18 +187,22 @@ ConstraintValidator<FlowValidation, Flow> flowValidation() {
 
             List<String> violations = new ArrayList<>();
 
-            // task unique id
+            // tasks unique id
             List<String> taskIds = value.allTasksWithChilds()
                 .stream()
                 .map(Task::getId)
                 .toList();
-            List<String> taskDuplicates = taskIds
-                .stream()
-                .distinct()
-                .filter(entry -> Collections.frequency(taskIds, entry) > 1)
-                .toList();
-            if (taskDuplicates.size() > 0) {
-                violations.add("Duplicate task id with name [" + String.join(", ", taskDuplicates) + "]");
+
+            List<String> duplicateIds = getDuplicates(taskIds);
+
+            if (!duplicateIds.isEmpty()) {
+                violations.add("Duplicate task id with name [" + String.join(", ", duplicateIds) + "]");
+            }
+
+            duplicateIds = getDuplicates(value.allTriggerIds());
+
+            if (!duplicateIds.isEmpty()) {
+                violations.add("Duplicate trigger id with name [" + String.join(", ", duplicateIds) + "]");
             }
 
             value.allTasksWithChilds()
@@ -202,8 +210,8 @@ ConstraintValidator<FlowValidation, Flow> flowValidation() {
                 .forEach(
                     task -> {
                         if (task instanceof io.kestra.core.tasks.flows.Flow taskFlow
-                                && taskFlow.getFlowId().equals(value.getId())
-                                && taskFlow.getNamespace().equals(value.getNamespace())) {
+                            && taskFlow.getFlowId().equals(value.getId())
+                            && taskFlow.getNamespace().equals(value.getNamespace())) {
                             violations.add("Recursive call to flow [" + value.getId() + "]");
                         }
                     }
@@ -234,6 +242,13 @@ ConstraintValidator<FlowValidation, Flow> flowValidation() {
         };
     }
 
+    private static List<String> getDuplicates(List<String> taskIds) {
+        return taskIds.stream()
+            .distinct()
+            .filter(entry -> Collections.frequency(taskIds, entry) > 1)
+            .collect(Collectors.toList());
+    }
+
     @Singleton
     ConstraintValidator<Regex, String> patternValidator() {
         return (value, annotationMetadata, context) -> {
@@ -243,7 +258,7 @@ ConstraintValidator<Regex, String> patternValidator() {
 
             try {
                 Pattern.compile(value);
-            } catch(PatternSyntaxException e) {
+            } catch (PatternSyntaxException e) {
                 context.messageTemplate("invalid pattern [" + value + "]");
                 return false;
             }

diff --git a/core/src/test/java/io/kestra/core/models/flows/FlowTest.java b/core/src/test/java/io/kestra/core/models/flows/FlowTest.java
index 80802f1451..cb8a06f999 100644
--- a/core/src/test/java/io/kestra/core/models/flows/FlowTest.java
+++ b/core/src/test/java/io/kestra/core/models/flows/FlowTest.java
@@ -35,7 +35,8 @@ void duplicate() {
         assertThat(validate.isPresent(), is(true));
         assertThat(validate.get().getConstraintViolations().size(), is(1));
 
-        assertThat(validate.get().getMessage(), containsString("Duplicate task id with name [date]"));
+        assertThat(validate.get().getMessage(), containsString("Duplicate task id with name [date, listen]"));
+        assertThat(validate.get().getMessage(), containsString("Duplicate trigger id with name [trigger]"));
     }
 
     @Test
diff --git a/core/src/test/resources/flows/invalids/duplicate.yaml b/core/src/test/resources/flows/invalids/duplicate.yaml
index 594efc0b87..671f30b656 100644
--- a/core/src/test/resources/flows/invalids/duplicate.yaml
+++ b/core/src/test/resources/flows/invalids/duplicate.yaml
@@ -3,7 +3,7 @@ namespace: io.kestra.tests
 
 listeners:
   - tasks:
-      - id: date
+      - id: listen
         type: io.kestra.core.tasks.debugs.Return
         format: "{{taskrun.startDate}}"
 
@@ -11,6 +11,9 @@ tasks:
   - id: date
     type: io.kestra.core.tasks.debugs.Return
     format: "{{taskrun.startDate}}"
+  - id: listen
+    type: io.kestra.core.tasks.debugs.Return
+    format: "{{taskrun.startDate}}"
 
   - id: seq
     type: io.kestra.core.tasks.flows.Sequential
@@ -27,3 +30,10 @@ errors:
   - id: date
     type: io.kestra.core.tasks.debugs.Return
     format: "{{taskrun.startDate}}"
+triggers:
+  - id: trigger
+    type: io.kestra.core.models.triggers.types.Schedule
+    cron: '* * * * *'
+  - id: trigger
+    type: io.kestra.core.models.triggers.types.Webhook
+    key: t
\ No newline at end of file
