`http_response_size_bytes_sum`
 `http_response_size_bytes_count`
 due to removal from the prometheus client library. Prometheus http request meta-metrics are now generated from [`promhttp.InstrumentMetricHandler`](https://godoc.org/github.com/prometheus/client_golang/prometheus/promhttp#InstrumentMetricHandler) instead.
- Following metrics from kube-controller-manager are now marked as with the ALPHA stability level:

- github.com/prometheus/client_golang: [v1.16.0 → v1.19.1](https://github.com/prometheus/client_golang/compare/v1.16.0...v1.19.1)
- github.com/prometheus/client_model: [v0.4.0 → v0.6.1](https://github.com/prometheus/client_model/compare/v0.4.0...v0.6.1)
- github.com/prometheus/common: [v0.44.0 → v0.55.0](https://github.com/prometheus/common/compare/v0.44.0...v0.55.0)

  Therefore, expect a latency of about 30 seconds between when an API is added and when
  the garbage collector starts to manage it.


#### Monitoring/Prometheus

- github.com/prometheus/client_golang: [v1.14.0 → v1.16.0](https://github.com/prometheus/client_golang/compare/v1.14.0...v1.16.0)
- github.com/prometheus/client_model: [v0.3.0 → v0.4.0](https://github.com/prometheus/client_model/compare/v0.3.0...v0.4.0)
- github.com/prometheus/common: [v0.37.0 → v0.44.0](https://github.com/prometheus/common/compare/v0.37.0...v0.44.0)

* [fluentd-gcp-scaler addon] Bump fluentd-gcp-scaler to 0.4 to pick up security fixes. ([#67691](https://github.com/kubernetes/kubernetes/pull/67691), [@loburm](https://github.com/loburm))
    * [prometheus-to-sd addon] Bump prometheus-to-sd to 0.3.1 to pick up security fixes, bug fixes and new features.
    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.

- github.com/prometheus/client_golang: [v1.12.1 → v1.14.0](https://github.com/prometheus/client_golang/compare/v1.12.1...v1.14.0)
- github.com/prometheus/client_model: [v0.2.0 → v0.3.0](https://github.com/prometheus/client_model/compare/v0.2.0...v0.3.0)
- github.com/prometheus/common: [v0.32.1 → v0.37.0](https://github.com/prometheus/common/compare/v0.32.1...v0.37.0)

### GCP

- [stackdriver addon] Bumped prometheus-to-sd to v0.5.0 to pick up security fixes.
[fluentd-gcp addon] Bumped fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
[fluentd-gcp addon] Bumped event-exporter to v0.2.4 to pick up security fixes.
[fluentd-gcp addon] Bumped prometheus-to-sd to v0.5.0 to pick up security fixes.

* [stackdriver addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes. ([#75362](https://github.com/kubernetes/kubernetes/pull/75362), [@serathius](https://github.com/serathius))
    * [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.
    * [fluentd-gcp addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes.

- github.com/prometheus/client_golang: [v1.6.0 → v1.7.1](https://github.com/prometheus/client_golang/compare/v1.6.0...v1.7.1)
- github.com/prometheus/common: [v0.9.1 → v0.10.0](https://github.com/prometheus/common/compare/v0.9.1...v0.10.0)
- github.com/prometheus/procfs: [v0.0.11 → v0.1.3](https://github.com/prometheus/procfs/compare/v0.0.11...v0.1.3)

* [stackdriver addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes. ([#75362](https://github.com/kubernetes/kubernetes/pull/75362), [@serathius](https://github.com/serathius))
    * [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.
    * [fluentd-gcp addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes.