How to categorize this issue?

/area auto-scaling
/kind enhancement

What would you like to be added:

With the introduction of in-place Pod resource updates in VPA 1.4.0, the vpa-updater got instrumented with additional metrics, monitoring which can be very beneficial when evaluating the performance and behaviour of the new updateMode strategy ( i.e. InPlaceOrRecreate ). Much like the vpa-recommender and the vpa-admission-controller, that get their metrics scraped via

• vpa-recommender ServiceMonitor
  

  gardener/pkg/component/autoscaling/vpa/recommender.go

  Line 396 in 495eb66

  func (v *vpa) reconcileRecommenderServiceMonitor(serviceMonitor *monitoringv1.ServiceMonitor) {

• vpa-admission-controller ServiceMonitor

  gardener/pkg/component/autoscaling/vpa/admissioncontroller.go

  Line 336 in 495eb66

  func (v *vpa) reconcileAdmissionControllerServiceMonitor(serviceMonitor *monitoringv1.ServiceMonitor) {

the vpa-updater should also be monitored.

Why is this needed:

• To allow better observability of the vpa-updater and the overall health of the VPA deployment(s).
• To allow a more precise evaluation of the newly introduced InPlaceOrRecreate updateMode strategy in VPA.