### Added metrics
- Add `scheduler_goroutines` metric to track number of kube-scheduler binding and prioritizing goroutines ([#83535](https://github.com/kubernetes/kubernetes/pull/83535), [@wgliang](https://github.com/wgliang))
- Adding initial EndpointSlice metrics. ([#83257](https://github.com/kubernetes/kubernetes/pull/83257), [@robscott](https://github.com/robscott))

- Introduced new apiserver metric `apiserver_flowcontrol_current_inqueue_seats`. This metric is analogous to `apiserver_flowcontrol_current_inqueue_requests`, but tracks the total number of seats, as each request can take more than one seat. ([#119385](https://github.com/kubernetes/kubernetes/pull/119385), [@andrewsykim](https://github.com/andrewsykim))

- HPA controller exposes the following metrics from the kube-controller-manager. 
  - `metric_computation_duration_seconds`: The time(seconds) that the HPA controller takes to calculate one metric.
  - `metric_computation_total`: Number of metric computations. ([#116326](https://github.com/kubernetes/kubernetes/pull/116326), [@sanposhiho](https://github.com/sanposhiho)) [SIG Apps, Autoscaling and Instrumentation]

- Fix etcd_object_counts metric reported by kube-apiserver ([#94818](https://github.com/kubernetes/kubernetes/pull/94818), [@tkashem](https://github.com/tkashem)) [SIG API Machinery]

- Added a `source` label to the `resourceclaim_controller_resource_claims` metric.
  Added the `scheduler_resourceclaim_creates_total` metric for `DRAExtendedResource`. ([#134523](https://github.com/kubernetes/kubernetes/pull/134523), [@bitoku](https://github.com/bitoku)) [SIG Apps, Instrumentation, Node and Scheduling]

- Implemented `event_handling_duration_seconds` metric, which is the time the scheduler takes to handle each kind of events. ([#125929](https://github.com/kubernetes/kubernetes/pull/125929), [@sanposhiho](https://github.com/sanposhiho))

* azure: Add allow unsafe read from cache ([#83685](https://github.com/kubernetes/kubernetes/pull/83685), [@aramase](https://github.com/aramase))

(`node_config_last_known_good`), and active (`node_config_active`) config sources, and a metric indicating whether the node is experiencing a config-related error (`node_config_error`). The config source metrics always report the value `1`, and carry the `node_config_name`, `node_config_uid`, `node_config_resource_version`, and `node_config_kubelet_key labels`, which identify the config version. The error metric reports `1` if there is an error, `0` otherwise. ([#57527](https://github.com/kubernet...

- Included an additional resource labeltransformation in on_operations_total metric which could be used for resource specific validations for example handling of encryption config by the apiserver. ([#126512](https://github.com/kubernetes/kubernetes/pull/126512), [@kmala](https://github.com/kmala)) [SIG API Machinery, Auth, Etcd and Testing]

* Add apiserver metric for number of requests dropped because of inflight limit, making it easier to figure out on which dimension the master is overloaded. ([#58340](https://github.com/kubernetes/kubernetes/pull/58340), [@gmarek](https://github.com/gmarek))