FBRelayLogger: bugfixes (#250)

Summary:
Pull Request resolved: #250

* Dynolog is sending the wrong agent-type when gpu metrics are enabled. Agent-type is a constant string to identify the app that is collecting the metrics and it shouldn't change depending on the kind of metrics is sending.

* Dynolog is not able to send metrics if fbrelay service is restarted, that is because the socket used for the operations is broken. This fix recreates the socket if a failure to send metrics is detected.

Reviewed By: briancoutinho

Differential Revision: D56312126

fbshipit-source-id: a486f96f30e3fefdf934131df9176aafb8561ba1

dynolog/src/FBRelayLogger.cpp

@@ -157,7 +157,7 @@ void FBRelayLogger::finalize() {
        {
            {"hostname", hostname_},
            {"name", hostname_},
-           {"type", entity},
+           {"type", "dyno"},
            {"version", "0.1.0"},
        }},
       {"event", {{"module", entity}}},
@@ -172,6 +172,9 @@ void FBRelayLogger::finalize() {
   // try send
   if (!socket->send(data.dump())) {
     LOG(WARNING) << "Failed to send socket data";
+
+    // Re-init socket
+    initSocket();
   }
 }