Have you written operators for Kubernetes?

Yes, I have written operators for Kubernetes in Go. Operators allow automating the management of complex applications in Kubernetes by extending the cluster's API.

An example of a simple operator in Go using the controller-runtime library:

package controllers

import (
    "context"
    "sigs.k8s.io/controller-runtime/pkg/client"
    ctrl "sigs.k8s.io/controller-runtime"
    "sigs.k8s.io/controller-runtime/pkg/reconcile"
    myappv1 "my.domain/api/v1"
)

type MyAppReconciler struct {
    client.Client
}

func (r *MyAppReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
    var myApp myappv1.MyApp
    if err := r.Get(ctx, req.NamespacedName, &myApp); err != nil {
        return ctrl.Result{}, client.IgnoreNotFound(err)
    }
    // Resource management logic
    return ctrl.Result{}, nil
}

func (r *MyAppReconciler) SetupWithManager(mgr ctrl.Manager) error {
    return ctrl.NewControllerManagedBy(mgr).
        For(&myappv1.MyApp{}).
        Complete(r)
}

In this example, the operator monitors MyApp resources and implements their processing logic in the Reconcile method.