v0.4.0

Installation

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.4.0/components.yaml

Breaking changes

Manifests

• Metrics Server will use Kubelet IP addresses instead of DNS
• Deployment manifests are no longer located in deploy folder, but in manifest using Kustomize
• Metrics server will now run with system-cluster-critical pod priority meaning it can evict workloads with lower priority
• Renamed Pod port to https
• Removed kubernetes.io/name & kubernetes.io/cluster-service labels from Service

Container image

• Removed /healthz endpoint
• Some combinations of TLS flags are no longer allowed
• Metric metrics_server_kubelet_summary_request_duration_seconds was renamed to metrics_server_kubelet_request_duration_seconds
• Metric metrics_sever_kubelet_summary_scrapes_total was renamed to metrics_server_kubelet_request_total
• Metric metrics_server_scraper_last_time_seconds was renamed to metrics_server_kubelet_last_request_time_seconds
• Metric metrics_server_scraper_duration_seconds was deleted
• Metric metrics_server_kubelet_last_request_time_seconds had it label source renamed to node

Changes since 0.3.7

New Features

• Detect Kubelet port based on node status (@Poor12)
• Allow passing TLS certificate&key to kubelet client (@uthark)
• Added mmanifests configured with autoscaling (@serathius)
• Adopt Kustomize for manifests (@serathius)
• Implement server-side api output formatting (@smarterclayton)
• Order pods returned by API (@smarterclayton)
• Add pod disruption budget (@brianpursley)
• TLS flag validation (@AkashSarda)

Reliability

• Add properly designed readiness and liveliness probes and endpoints /livez and /readyz (@serathius, @hanumanthan)
• Set pod priority to system-cluster-critical (@serathius)

Optimizations

• Skip parsing not used fields in Summary API (@serathius)
• Use easyjson for parsing (@serathius)
• Pool buffer for scraping (@serathius)

Clean ups

• Removed spammy no metrics known for pod logs (@serathius)
• Named Service port https (@elmariofredo)
• Rename pod port to https (@serathius)
• Removed KubeUp labels (@serathius)
• Add copyright license headers verification (@dgrisonnet)
• Refactor of kubelet metrics (@serathius)
• Update golang version to 1.14 (@serathius)
• Update dependencies to kubernetes 1.19 (@serathius)

Tests

• Test k8s 1.19 in e2e tests (@serathius)

Documentation

• Document x509 errors in FAQ (@QianChenglong)
• REAME.md typo fixes (@zhiweiv)

Thanks to everyone who contributed to this release!