Allow showing ping requests in the console.

The default is false, but this can be enabled in the configuration if desired.

proxy/src/main/java/com/velocitypowered/proxy/config/VelocityConfiguration.java

@@ -423,6 +423,10 @@ public class VelocityConfiguration extends AnnotatedConfig implements ProxyConfi
     return advanced.isBungeePluginMessageChannel();
   }
 
+  public boolean isShowPingRequests() {
+    return advanced.isShowPingRequests();
+  }
+
   @Override
   public String toString() {
     return MoreObjects.toStringHelper(this)
@@ -679,6 +683,10 @@ public class VelocityConfiguration extends AnnotatedConfig implements ProxyConfi
     @ConfigKey("bungee-plugin-message-channel")
     private boolean bungeePluginMessageChannel = true;
 
+    @Comment("Shows ping requests to the proxy from clients.")
+    @ConfigKey("show-ping-requests")
+    private boolean showPingRequests = false;
+
     private Advanced() {
     }
 
@@ -692,6 +700,7 @@ public class VelocityConfiguration extends AnnotatedConfig implements ProxyConfi
         this.proxyProtocol = toml.getBoolean("proxy-protocol", false);
         this.tcpFastOpen = toml.getBoolean("tcp-fast-open", false);
         this.bungeePluginMessageChannel = toml.getBoolean("bungee-plugin-message-channel", true);
+        this.showPingRequests = toml.getBoolean("show-ping-requests", false);
       }
     }
 
@@ -727,6 +736,10 @@ public class VelocityConfiguration extends AnnotatedConfig implements ProxyConfi
       return bungeePluginMessageChannel;
     }
 
+    public boolean isShowPingRequests() {
+      return showPingRequests;
+    }
+
     @Override
     public String toString() {
       return "Advanced{"
@@ -738,6 +751,7 @@ public class VelocityConfiguration extends AnnotatedConfig implements ProxyConfi
           + ", proxyProtocol=" + proxyProtocol
           + ", tcpFastOpen=" + tcpFastOpen
           + ", bungeePluginMessageChannel=" + bungeePluginMessageChannel
+          + ", showPingRequests=" + showPingRequests
           + '}';
     }
   }

proxy/src/main/java/com/velocitypowered/proxy/connection/client/StatusSessionHandler.java

@@ -25,9 +25,13 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 public class StatusSessionHandler implements MinecraftSessionHandler {
 
+  private static final Logger logger = LogManager.getLogger(StatusSessionHandler.class);
+
   private final VelocityServer server;
   private final MinecraftConnection connection;
   private final InboundConnection inbound;
@@ -39,6 +43,14 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
     this.inbound = inbound;
   }
 
+  @Override
+  public void activated() {
+    if (server.getConfiguration().isShowPingRequests()) {
+      logger.info("{} is pinging the server with version {}", this.inbound,
+          this.connection.getProtocolVersion());
+    }
+  }
+
   private ServerPing constructLocalPing(ProtocolVersion version) {
     VelocityConfiguration configuration = server.getConfiguration();
     return new ServerPing(