m1a2st commented on code in PR #19527:
URL: https://github.com/apache/kafka/pull/19527#discussion_r2158874536


##########
clients/src/main/java/org/apache/kafka/common/security/authenticator/LoginManager.java:
##########
@@ -53,20 +56,30 @@ public class LoginManager {
     // dynamic configs (broker or client)
     private static final Map<LoginMetadata<Password>, LoginManager> 
DYNAMIC_INSTANCES = new HashMap<>();
 
-    private final Login login;
+    private final Plugin<Login> loginPlugin;
     private final LoginMetadata<?> loginMetadata;
     private final AuthenticateCallbackHandler loginCallbackHandler;
     private int refCount;
 
-    private LoginManager(JaasContext jaasContext, String saslMechanism, 
Map<String, ?> configs,
-                 LoginMetadata<?> loginMetadata) throws LoginException {
+    private LoginManager(
+        JaasContext jaasContext, 
+        String saslMechanism, 
+        Map<String, ?> configs,
+        LoginMetadata<?> loginMetadata,
+        ConnectionMode connectionMode,
+        Metrics metrics
+    ) throws LoginException {
         this.loginMetadata = loginMetadata;
-        this.login = Utils.newInstance(loginMetadata.loginClass);
+        Login login = Utils.newInstance(loginMetadata.loginClass);
+        if (connectionMode == ConnectionMode.SERVER)  
+            this.loginPlugin = Plugin.wrapInstance(login, metrics, 
SaslConfigs.SASL_LOGIN_CLASS, "mechanism", saslMechanism);

Review Comment:
   Conclusion:
   server side:
   ```
   tags = Map.of(
       "config", "base column",
       "class", "base column",
       "mechanism", "KIP-877 spec",
       "networkProcessor", "fromProcessor",
       "listener", "fromProcessor"
   )
   ```
   server-client side:
   ```
   tags = Map.of(
       "config", "base column",
       "class", "base column",
       "component": "Class name or thread name",
       "node-id": "kafka node id"
   )
   ```
   client-client side:
   ```
   tags = Map.of(
       "config", "base column",
       "class", "base column",
       "client-id": "origin client metrics id not KIP-877 spec"
   )
   
   cc @mimaison, if you have any feedback, please let me know, thanks



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