Add WARNING prefix to fpd type normalization warnings (prebid#912)

Author: BraslavskiyAndrey

src/main/java/org/prebid/server/auction/OrtbTypesResolver.java

@@ -173,7 +173,7 @@ private JsonNode normalizeNode(JsonNode containerNode, String nodeName,
                                 () -> toCommaSeparatedTextNode(containerObjectNode, fieldName, nodeName, nodePrefix,
                                         warnings)));
             } else {
-                warnings.add(String.format("FDP warning: %s%s field ignored. Expected type is object, but was `%s`.",
+                warnings.add(String.format("%s%s field ignored. Expected type is object, but was `%s`.",
                         nodePrefix, nodeName, containerNode.getNodeType().name()));
                 return null;
             }
@@ -252,14 +252,18 @@ private static boolean isTextualArray(ArrayNode arrayNode) {
     private void processWarnings(List<String> resolverWarning, List<String> warnings, String containerValue,
                                  String referer, String containerName) {
         if (CollectionUtils.isNotEmpty(resolverWarning)) {
-            warnings.addAll(resolverWarning);
+            warnings.addAll(updateWithWarningPrefix(resolverWarning));
             // log only 1% of cases
             if (System.currentTimeMillis() % 100 == 0) {
-                logger.info(String.format("%s. \n Referer = %s and %s = %s",
+                logger.info(String.format("WARNINGS: %s. \n Referer = %s and %s = %s",
                         String.join("\n", resolverWarning),
                         StringUtils.isNotBlank(referer) ? referer : UNKNOWN_REFERER,
                         containerName, containerValue));
             }
         }
     }
+
+    private List<String> updateWithWarningPrefix(List<String> resolverWarning) {
+        return resolverWarning.stream().map(warning -> "WARNING: " + warning).collect(Collectors.toList());
+    }
 }

src/test/java/org/prebid/server/auction/OrtbTypesResolverTest.java

@@ -40,8 +40,9 @@ public void normalizeTargetingShouldConvertArrayToFirstElementFieldForUserAndWri
         // then
         assertThat(inputParam).isEqualTo(mapper.createObjectNode().set("user",
                 mapper.createObjectNode().put("gender", "male")));
-        assertThat(errors).containsOnly("Incorrect type for first party data field targeting.user.gender, expected is"
-                + " string, but was an array of strings. Converted to string by taking first element of array.");
+        assertThat(errors).containsOnly("WARNING: Incorrect type for first party data field targeting.user.gender,"
+                + " expected is string, but was an array of strings. Converted to string by taking first element "
+                + "of array.");
     }
 
     @Test
@@ -57,8 +58,9 @@ public void normalizeTargetingShouldConvertArrayToCommaSeparatedStringFieldForUs
         // then
         assertThat(inputParam).isEqualTo(mapper.createObjectNode().set("user",
                 mapper.createObjectNode().put("keywords", "keyword1,keyword2")));
-        assertThat(errors).containsOnly("Incorrect type for first party data field targeting.user.keywords, expected is"
-                + " string, but was an array of strings. Converted to string by separating values with comma.");
+        assertThat(errors).containsOnly("WARNING: Incorrect type for first party data field targeting.user.keywords,"
+                + " expected is string, but was an array of strings. Converted to string by separating values with"
+                + " comma.");
     }
 
     @Test
@@ -85,7 +87,7 @@ public void normalizeTargetingToCommaSeparatedTextNodeShouldWriteMessageAndRemov
 
         // then
         assertThat(inputParam).isEqualTo(mapper.createObjectNode().set("user", mapper.createObjectNode()));
-        assertThat(errors).containsOnly("Incorrect type for first party data field targeting.user.keywords,"
+        assertThat(errors).containsOnly("WARNING: Incorrect type for first party data field targeting.user.keywords,"
                 + " expected strings, but was `ARRAY of different types`. Failed to convert to correct type.");
     }
 
@@ -101,7 +103,7 @@ public void normalizeTargetingToFirstElementTextNodeShouldWriteMessageAndRemoveF
 
         // then
         assertThat(inputParam).isEqualTo(mapper.createObjectNode().set("user", mapper.createObjectNode()));
-        assertThat(errors).containsOnly("Incorrect type for first party data field targeting.user.gender,"
+        assertThat(errors).containsOnly("WARNING: Incorrect type for first party data field targeting.user.gender,"
                 + " expected strings, but was `NUMBER`. Failed to convert to correct type.");
     }