feat: add discount_jwt monitoring

ecommerce/extensions/offer/dynamic_conditional_offer.py

@@ -4,6 +4,7 @@
 """
 import crum
 import waffle
+from edx_django_utils.monitoring import set_custom_attribute
 from oscar.core.loading import get_class, get_model
 
 from ecommerce.extensions.api.handlers import jwt_decode_handler
@@ -30,8 +31,10 @@ def get_decoded_jwt_discount_from_request():
     else:
         discount_jwt = request.POST.get('discount_jwt')
     if not discount_jwt:
+        set_custom_attribute('ecom_discount_jwt', 'not-found')
         return None
 
+    set_custom_attribute('ecom_discount_jwt', 'found')
     return jwt_decode_handler(discount_jwt)