fix: Add tls-server-name support for Teleport proxy (#495)

This patch adds support for the `tls-server-name` field from kubeconfig,
which is required when connecting to Kubernetes clusters through
Teleport proxy or similar services that use TLS SNI for routing.

The fix follows the same pattern already used for `proxy-url` support,
loading the tls-server-name from cluster config and passing it to the
kubernetes client configuration.

Fixes #495

Author: arikalon1

robusta_krr/core/integrations/kubernetes/config_patch.py

@@ -16,23 +16,30 @@ def _load_cluster_info(self):
         if "proxy-url" in self._cluster:
             self.proxy = self._cluster["proxy-url"]
 
+        # Support tls-server-name for Teleport and similar proxies
+        # See: https://github.com/robusta-dev/krr/issues/495
+        if "tls-server-name" in self._cluster:
+            self.tls_server_name = self._cluster["tls-server-name"]
+
     def _set_config(self, client_configuration: Configuration):
         super()._set_config(client_configuration)
 
-        key = "proxy"
-        if key in self.__dict__:
-            setattr(client_configuration, key, getattr(self, key))
+        for key in ("proxy", "tls_server_name"):
+            if key in self.__dict__:
+                setattr(client_configuration, key, getattr(self, key))
 
 
 class Configuration(configuration.Configuration):
     def __init__(
         self,
         proxy: Optional[str] = None,
+        tls_server_name: Optional[str] = None,
         **kwargs,
     ):
         super().__init__(**kwargs)
 
         self.proxy = proxy
+        self.tls_server_name = tls_server_name
 
 
 configuration.Configuration = Configuration