getinfo deprecation warning

src/rpc/misc.cpp

@@ -50,6 +50,7 @@ UniValue getinfo(const JSONRPCRequest& request)
             "\nDEPRECATED. Returns an object containing various state info.\n"
             "\nResult:\n"
             "{\n"
+            "  \"deprecation-warning\": \"...\" (string) warning that the getinfo command is deprecated and will be removed in 0.16\n"
             "  \"version\": xxxxx,           (numeric) the server version\n"
             "  \"protocolversion\": xxxxx,   (numeric) the protocol version\n"
             "  \"walletversion\": xxxxx,     (numeric) the wallet version\n"
@@ -84,6 +85,8 @@ UniValue getinfo(const JSONRPCRequest& request)
     GetProxy(NET_IPV4, proxy);
 
     UniValue obj(UniValue::VOBJ);
+    obj.push_back(Pair("deprecation-warning", "WARNING: getinfo is deprecated and will be fully removed in 0.16."
+        " Projects should transition to using getblockchaininfo, getnetworkinfo, and getwalletinfo before upgrading to 0.16"));
     obj.push_back(Pair("version", CLIENT_VERSION));
     obj.push_back(Pair("protocolversion", PROTOCOL_VERSION));
 #ifdef ENABLE_WALLET