Set cluster_name var in logs vars separately and not in init

cmd/controller/main.go

@@ -17,8 +17,11 @@ package main
 
 import (
 	"github.com/kanisterio/kanister/pkg/kancontroller"
+	"github.com/kanisterio/kanister/pkg/log"
 )
 
 func main() {
+	log.SetupClusterNameInLogVars()
+
 	kancontroller.Execute()
 }

cmd/kanctl/main.go

@@ -17,6 +17,7 @@ package main
 
 import (
 	"github.com/kanisterio/kanister/pkg/kanctl"
+	"github.com/kanisterio/kanister/pkg/log"
 )
 
 func init() {
@@ -25,5 +26,7 @@ func init() {
 }
 
 func main() {
+	log.SetupClusterNameInLogVars()
+
 	kanctl.Execute()
 }

cmd/reposervercontroller/main.go

@@ -68,6 +68,8 @@ func main() {
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	logLevel := getLogLevel()
 
+	log.SetupClusterNameInLogVars()
+
 	opts := zap.Options{
 		Level: logLevel,
 	}

pkg/log/log.go

@@ -93,7 +93,11 @@ func initEnvVarFields() {
 			envVarFields = field.Add(envVarFields, strings.ToLower(e), ev)
 		}
 	}
+}
 
+// SetupClusterNameInLogVars sets up the `cluster_name` field in `envVarFields`
+// so that it can be printed with the logs.
+func SetupClusterNameInLogVars() {
 	if clsName, err := config.GetClusterName(nil); err == nil {
 		envVarFields = field.Add(envVarFields, "cluster_name", clsName)
 	}