add trace logging for overlarge payloads

Author: yaauie

lib/logstash/outputs/tcp.rb

@@ -176,12 +176,14 @@ def register
           end
 
           # Now send the payload
+          @logger.trace("transmitting #{payload.bytesize} bytes", socket: @client_socket&.peer) if @logger.trace? && payload && !payload.empty?
           while payload && payload.bytesize > 0
             written_bytes_size = client_socket.syswrite(payload)
             payload = payload.byteslice(written_bytes_size..-1)
+            @logger.trace(">transmitted #{written_bytes_size} bytes; #{payload.bytesize} bytes remain", socket: @client_socket&.peer) if @logger.trace?
           end
         rescue => e
-          log_warn "client socket failed:", e, host: @host, port: @port, socket: client_socket&.to_s
+          log_warn "client socket failed:", e, host: @host, port: @port, socket: client_socket&.peer
           client_socket.close rescue nil
           client_socket = nil
           sleep @reconnect_interval