rpc: Introduce getaddrmaninfo for count of addresses stored in new/tried table

src/rpc/net.cpp

@@ -1016,6 +1016,55 @@ static RPCHelpMan sendmsgtopeer()
     };
 }
 
+static RPCHelpMan getaddrmaninfo()
+{
+    return RPCHelpMan{"getaddrmaninfo",
+                      "\nProvides information about the node's address manager by returning the number of "
+                      "addresses in the `new` and `tried` tables and their sum for all networks.\n"
+                      "This RPC is for testing only.\n",
+                      {},
+                      RPCResult{
+                              RPCResult::Type::OBJ_DYN, "", "json object with network type as keys",
+                              {
+                                      {RPCResult::Type::OBJ, "network", "the network (" + Join(GetNetworkNames(), ", ") + ")",
+                                       {
+                                               {RPCResult::Type::NUM, "new", "number of addresses in the new table, which represent potential peers the node has discovered but hasn't yet successfully connected to."},
+                                               {RPCResult::Type::NUM, "tried", "number of addresses in the tried table, which represent peers the node has successfully connected to in the past."},
+                                               {RPCResult::Type::NUM, "total", "total number of addresses in both new/tried tables"},
+                                       }},
+                              }
+                      },
+                      RPCExamples{
+                              HelpExampleCli("getaddrmaninfo", "")
+                              + HelpExampleRpc("getaddrmaninfo", "")
+                      },
+                      [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
+                      {
+                          NodeContext& node = EnsureAnyNodeContext(request.context);
+                          if (!node.addrman) {
+                              throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Address manager functionality missing or disabled");
+                          }
+
+                          UniValue ret(UniValue::VOBJ);
+                          for (int n = 0; n < NET_MAX; ++n) {
+                              enum Network network = static_cast<enum Network>(n);
+                              if (network == NET_UNROUTABLE || network == NET_INTERNAL) continue;
+                              UniValue obj(UniValue::VOBJ);
+                              obj.pushKV("new", node.addrman->Size(network, true));
+                              obj.pushKV("tried", node.addrman->Size(network, false));
+                              obj.pushKV("total", node.addrman->Size(network));
+                              ret.pushKV(GetNetworkName(network), obj);
+                          }
+                          UniValue obj(UniValue::VOBJ);
+                          obj.pushKV("new", node.addrman->Size(std::nullopt, true));
+                          obj.pushKV("tried", node.addrman->Size(std::nullopt, false));
+                          obj.pushKV("total", node.addrman->Size());
+                          ret.pushKV("all_networks", obj);
+                          return ret;
+                      },
+    };
+}
+
 void RegisterNetRPCCommands(CRPCTable& t)
 {
     static const CRPCCommand commands[]{
@@ -1035,6 +1084,7 @@ void RegisterNetRPCCommands(CRPCTable& t)
         {"hidden", &addconnection},
         {"hidden", &addpeeraddress},
         {"hidden", &sendmsgtopeer},
+        {"hidden", &getaddrmaninfo},
     };
     for (const auto& c : commands) {
         t.appendCommand(c.name, &c);

src/test/fuzz/rpc.cpp

@@ -110,6 +110,7 @@ const std::vector<std::string> RPC_COMMANDS_SAFE_FOR_FUZZING{
     "generate",
     "generateblock",
     "getaddednodeinfo",
+    "getaddrmaninfo",
     "getbestblockhash",
     "getblock",
     "getblockchaininfo",