[Enhancement](heartbeat) make heartbeat ok when config repeated host-ip pairs (#21228)

be/src/util/network_util.cpp

@@ -96,7 +96,15 @@ Status hostname_to_ip_addrs(const std::string& name, std::vector<std::string>* a
             return Status::InternalError("Could not convert IPv4 address for: {}", name);
         }
 
-        addresses->push_back(std::string(addr_buf));
+        // add address if not exists
+        std::string address = std::string(addr_buf);
+        if (std::find(addresses->begin(), addresses->end(), address) != addresses->end()) {
+            LOG(WARNING) << "Repeated ip addresses has been found for host: " << name
+                         << ", ip address:" << address
+                         << ", please check your network configuration";
+        } else {
+            addresses->push_back(address);
+        }
         it = it->ai_next;
     }