Update tags to be a single tag with matching rules

Author: manuel-alvarez-alvarez

ddtrace/appsec/ai_guard/_api_client.py

@@ -240,8 +240,8 @@ def evaluate(self, messages: List[Message], options: Optional[Options] = None) -
                         )
 
                     span.set_tag(AI_GUARD.ACTION_TAG, action)
-                    for tag in tags:
-                        span.set_tag(AI_GUARD.TAG + ".tag." + tag, "true")
+                    if len(tags) > 0:
+                        span.set_tag(AI_GUARD.TAG + ".matching_rules", json.dumps(tags))
                     if reason:
                         span.set_tag(AI_GUARD.REASON_TAG, reason)
                 else:

tests/appsec/ai_guard/api/test_api_client.py

@@ -1,3 +1,4 @@
+import json
 from itertools import product
 from unittest.mock import Mock
 from unittest.mock import patch
@@ -114,8 +115,8 @@ def test_evaluate_method(
         expected_tags.update({"ai_guard.tool_name": "calc"})
     if action != "ALLOW" and blocking:
         expected_tags.update({"ai_guard.blocked": "true"})
-    for tag in tags:
-        expected_tags.update({"ai_guard.tag." + tag: "true"})
+    if len(tags) > 0:
+        expected_tags.update({"ai_guard.matching_rules": json.dumps(tags)})
     assert_ai_guard_span(
         tracer,
         messages,