fix(inputs/kube_inventory): set TLS server name config properly (#9975)

plugins/inputs/kube_inventory/README.md

@@ -74,6 +74,8 @@ avoid cardinality issues:
   # tls_cert = "/path/to/certfile"
   ## Used for TLS client certificate authentication
   # tls_key = "/path/to/keyfile"
+  ## Send the specified TLS server name via SNI
+  # tls_server_name = "kubernetes.example.com"
   ## Use TLS but skip chain & host verification
   # insecure_skip_verify = false
 

plugins/inputs/kube_inventory/client.go

@@ -23,7 +23,7 @@ type client struct {
 func newClient(baseURL, namespace, bearerToken string, timeout time.Duration, tlsConfig tls.ClientConfig) (*client, error) {
 	c, err := kubernetes.NewForConfig(&rest.Config{
 		TLSClientConfig: rest.TLSClientConfig{
-			ServerName: baseURL,
+			ServerName: tlsConfig.ServerName,
 			Insecure:   tlsConfig.InsecureSkipVerify,
 			CAFile:     tlsConfig.TLSCA,
 			CertFile:   tlsConfig.TLSCert,

plugins/inputs/kube_inventory/kube_state.go

@@ -81,6 +81,7 @@ var sampleConfig = `
   # tls_ca = "/path/to/cafile"
   # tls_cert = "/path/to/certfile"
   # tls_key = "/path/to/keyfile"
+  # tls_server_name = "kubernetes.example.com"
   ## Use TLS but skip chain & host verification
   # insecure_skip_verify = false
 `