stats: log error when missing stats values (v2)

Related: SYS#4877
Change-Id: I5140d967c2f1d36dadf93b03e52b9bbd42e2a3a6
diff --git a/src/stat_item.c b/src/stat_item.c
index 2d96444..40374a7 100644
--- a/src/stat_item.c
+++ b/src/stat_item.c
@@ -261,6 +261,10 @@
 
 	*next_id = item_value->id + 1;
 
+	if (id_delta > 1) {
+		LOGP(DLSTATS, LOGL_ERROR, "%s: %d stats values skipped\n", item->desc->name, id_delta - 1);
+	}
+
 	return id_delta;
 }