configure `monitors` and `dashboards` for flux, istio, and cert-manager

base/cert-manager/helmrelease.yaml

base/flux/monitoring/dashboards/cluster.json

base/flux/monitoring/dashboards/control-plane.json

base/flux/monitoring/dashboards/kustomization.yaml

base/flux/monitoring/kustomization.yaml

base/flux/monitoring/monitors/kustomization.yaml

base/flux/monitoring/monitors/podmonitors.yaml

base/istio/kustomization.yaml

base/istio/monitoring/dashboards/istio-mesh-dashboard.json

...io/monitoring/dashboards/istio-performance-dashboard.json

.../istio/monitoring/dashboards/istio-service-dashboard.json

...istio/monitoring/dashboards/istio-workload-dashboard.json

base/istio/monitoring/dashboards/kustomization.yaml

base/istio/monitoring/dashboards/mixer-dashboard.json

base/istio/monitoring/dashboards/pilot-dashboard.json

base/istio/monitoring/kustomization.yaml

base/istio/monitoring/monitors/kustomization.yaml

base/istio/monitoring/monitors/servicemonitors.yaml

instance/flux-system/kustomizations/cert-manager.yaml

instance/istio-system/Kptfile