{"id":"rancher-metrics-server","name":"metrics-server","homepage":"https://hub.docker.com/r/rancher/metrics-server","repo_url":"https://hub.docker.com/r/rancher/metrics-server","category":"monitoring","subcategories":[],"tags":["kubernetes","metrics","autoscaling","observability","infrastructure"],"what_it_does":"metrics-server is a Kubernetes add-on that aggregates resource usage metrics (CPU/memory) from kubelets and exposes them to the Kubernetes API for use by tools like kubectl top, Horizontal Pod Autoscaler (HPA), and other metrics consumers.","use_cases":["Enable kubectl top (top node/pod) by providing aggregated resource metrics","Support Horizontal Pod Autoscaler based on CPU/memory utilization","Provide metrics to other components that rely on the Kubernetes metrics.k8s.io API"],"not_for":["General-purpose metrics storage/visualization (e.g., long-term retention/graphs)","Replacing Prometheus/Grafana for full monitoring and alerting","Reporting application-level metrics beyond CPU/memory resource usage"],"best_when":null,"avoid_when":null,"alternatives":["Prometheus + adapters (e.g., Prometheus Adapter)","kube-state-metrics (for cluster state, not resource usage)","Cloud provider monitoring integrations (with suitable adapters)"],"af_score":30.5,"security_score":58.5,"reliability_score":47.5,"package_type":"mcp_server","discovery_source":["docker_mcp"],"priority":"low","status":"evaluated","version_evaluated":null,"last_evaluated":"2026-04-04T19:37:11.667301+00:00","interface":{"has_rest_api":false,"has_graphql":false,"has_grpc":false,"has_mcp_server":false,"mcp_server_url":null,"has_sdk":false,"sdk_languages":[],"openapi_spec_url":null,"webhooks":false},"auth":{"methods":["Kubernetes service account/RBAC","In-cluster authorization via Kubernetes API server access controls"],"oauth":false,"scopes":false,"notes":"metrics-server typically runs as a cluster add-on and relies on Kubernetes RBAC and in-cluster connectivity; no external OAuth scopes are indicated from the provided info."},"pricing":{"model":null,"free_tier_exists":false,"free_tier_limits":null,"paid_tiers":[],"requires_credit_card":false,"estimated_workload_costs":null,"notes":"Open-source Kubernetes component; pricing is not applicable based on provided information."},"requirements":{"requires_signup":false,"requires_credit_card":false,"domain_verification":false,"data_residency":[],"compliance":[],"min_contract":null},"agent_readiness":{"af_score":30.5,"security_score":58.5,"reliability_score":47.5,"mcp_server_quality":0.0,"documentation_accuracy":30.0,"error_message_quality":0.0,"error_message_notes":null,"auth_complexity":45.0,"rate_limit_clarity":10.0,"tls_enforcement":70.0,"auth_strength":60.0,"scope_granularity":50.0,"dependency_hygiene":50.0,"secret_handling":60.0,"security_notes":"Runs in-cluster and communicates with kubelets and the Kubernetes API; effective security depends on correct TLS settings and least-privilege RBAC. No direct evidence of secret-handling or dependency posture from the provided info.","uptime_documented":30.0,"version_stability":60.0,"breaking_changes_history":60.0,"error_recovery":40.0,"idempotency_support":"false","idempotency_notes":null,"pagination_style":"none","retry_guidance_documented":false,"known_agent_gotchas":["Kubernetes add-ons require cluster-admin-level setup (RBAC, TLS/kubelet auth, wiring to kubelets) which may cause confusing failures if misconfigured","Behavior can vary by Kubernetes version and kubelet configuration; agent automation should validate API availability (metrics.k8s.io) after deployment"]}}