* Add aggregator_unavailable_apiservice_{count,gauge} metrics in the kube-aggregator. ([#71380](https://github.com/kubernetes/kubernetes/pull/71380), [@sttts](https://github.com/sttts))

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  - `kube-apiserver` publishes `apiserver_requested_deprecated_apis` gauge metrics set to `1` for deprecated APIs which have been requested, with `group`, `version`, `resource`, `subresource`, and `removed_release` labels ([#73032](https://github.com/kubernetes/kubernetes/pull/73032), [@liggitt](https://github.com/liggitt))...

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- Adds two new metrics to cronjobs, a histogram to track the time difference when a job is created and the expected time when it should be created, as well as a gauge for the missed schedules of a cronjob ([#99341](https://github.com/kubernetes/kubernetes/pull/99341), [@alaypatel07](https://github.com/alaypatel07))

- Client-go now exposes two new metrics to monitor the client-go logic that
  generate http.Transports for the clients.
  
  - `rest_client_transport_cache_entries` is a gauge metric
  with the number of existing entries in the internal cache
  
  - `rest_client_transport_create_calls_total` is a counter
  that increments each time a new transport is created, storing

- Added two client certificate metrics for exec auth:
    - `rest_client_certificate_expiration_seconds` a gauge reporting the lifetime of the current client certificate. Reports the time of expiry in seconds since January 1, 1970 UTC.

### Deprecated/changed metrics

- kubelet probe metrics are now of the counter type rather than the gauge type, and the `prober_probe_result` has been replaced by `prober_probe_total`. ([#76074](https://github.com/kubernetes/kubernetes/pull/76074), [@danielqsj](https://github.com/danielqsj))

- GLBC has been updated to v1.2.3 ([#66793](https://github.com/kubernetes/kubernetes/pull/66793))
- Ingress-gce has been updated to v 1.2.3 ([#66793](https://github.com/kubernetes/kubernetes/pull/66793))
- ip-masq-agen has been updated to v2.1.1 ([#67916](https://github.com/kubernetes/kubernetes/pull/67916))
- [v1.12.0-rc.2](#v1120-rc2)
- [v1.12.0-rc.1](#v1120-rc1)
- [v1.12.0-beta.2](#v1120-beta2)
- [v1.12.0-beta.1](#v1120-beta1)