I had to manually apply changes to my cluster, but now a lot of it is controlled from git thanks to ArgoCD.
ArgoCD will sync manifests from a git repo to the cluster. It continuously watches to make sure the desired state (from git) matches the observed state (in the cluster). You configure ArgoCD using CRDs. Argo has Apps and Projects. A Project configures access for Apps and an App represents a repo that deploys Kubernetes objects.
ArgoCD also comes with a dashboard that shows the apps and their status. You can also get a badge to put in the repo to show overall status.
Managing Kubernetes like this (once everything is automated) allows me to stand up a cluster with the same state simply by installing ArgoCD and applying an ArgoCD App.
It also keeps me from accidentally messing with the cluster since even if I delete a Deployment, ArgoCD will reapply it.