Fix some issues with Telemetry

lib/xandra/telemetry.ex

@@ -270,8 +270,20 @@ defmodule Xandra.Telemetry do
   def handle_event(event, measurements, metadata, config)
 
   def handle_event([:xandra, :cluster | event], measurements, metadata, :no_config) do
-    %Host{address: address, port: port} = metadata.host
-    logger_meta = [xandra_address: address, xandra_port: port]
+    logger_meta =
+      case Map.fetch(metadata, :host) do
+        {:ok, %Host{address: address, port: port}} ->
+          address =
+            case address do
+              ip when is_tuple(ip) -> ip |> :inet.ntoa() |> to_string()
+              str when is_list(str) -> to_string(str)
+            end
+
+          [xandra_address: address, xandra_port: port]
+
+        :error ->
+          []
+      end
 
     case event do
       [:change_event] ->

test/xandra/cluster/control_connection_test.exs

@@ -54,7 +54,7 @@ defmodule Xandra.Cluster.ControlConnectionTest do
         assert %Host{address: {127, 0, 0, 1}} = local_peer
       end)
 
-    assert log =~ "Error connecting: non-existing domain"
+    assert log =~ "Control connection failed to connect"
     assert log =~ "xandra_address=bad-domain"
     assert log =~ "xandra_port=9042"
   end
@@ -72,7 +72,7 @@ defmodule Xandra.Cluster.ControlConnectionTest do
         assert {:disconnected, _data} = :sys.get_state(ctrl_conn)
       end)
 
-    assert log =~ "Error connecting: non-existing domain"
+    assert log =~ "Control connection failed to connect"
     assert log =~ "xandra_address=bad-domain"
     assert log =~ "xandra_address=other-bad-domain"
   end

test/xandra/connection_error_test.exs

@@ -36,8 +36,12 @@ defmodule Xandra.ConnectionErrorTest do
     end
 
     test "with any other reason" do
-      assert message("connect", :banana) ==
-               ~s(action "connect" failed with reason: :banana)
+      message = message("connect", :banana)
+
+      assert message in [
+               ~s(action "connect" failed with reason: :banana),
+               ~s(action "connect" failed with reason: unknown POSIX error: banana)
+             ]
     end
   end