metrics-server-metrics-server

metrics-server-metrics-server appears to refer to the Kubernetes metrics-server component, which aggregates resource usage metrics (CPU/memory) from node Kubelets and exposes them via the Kubernetes metrics.k8s.io API so tools like kubectl top and Horizontal Pod Autoscaler can consume them.

Evaluated Apr 04, 2026 (17d ago)

Homepage ↗ Repo ↗ Monitoring kubernetes metrics observability hpa kubectl-top

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Security is primarily inherited from Kubernetes (TLS to API server, RBAC for access) and kubelet configuration. Key risks commonly include over-permissive RBAC, permissive kubelet access flags, and exposure of metrics endpoints within the cluster.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You need basic Kubernetes resource metrics (CPU/memory) to power kubectl top and autoscaling, and you can operate a standard Kubernetes add-on within your cluster.

Avoid When

You require long-term retention, complex metric queries, or guaranteed metric accuracy across all workloads without tuning.

Use Cases

• Enable kubectl top for cluster nodes/pods
• Support Kubernetes Horizontal Pod Autoscaler (HPA) or other autoscaling workflows that rely on metrics.k8s.io
• Provide near-real-time CPU/memory usage for dashboards and alerting that consume Kubernetes metrics API

Not For

• Storing long-term metrics (use Prometheus/Grafana or similar)
• High-resolution time-series analytics
• Use as a security boundary or authentication/authorization provider

Interface

REST API

Yes

GraphQL

gRPC

MCP Server

SDK

Webhooks

Authentication

Methods: Kubernetes in-cluster authentication (service account / RBAC) Kubelet authentication as configured in the metrics-server deployment

OAuth: No Scopes: No

No end-user OAuth-style auth is indicated; access to the metrics API is governed by Kubernetes API access and RBAC. Exact kubelet auth method depends on deployment flags (not provided here).

Pricing

Free tier: No

Requires CC: No

Open-source Kubernetes component; operational cost is infrastructure/cluster resources rather than a vendor pricing model.

Agent Metadata

Pagination

none

Idempotent

True

Retry Guidance

Not documented

Known Gotchas

⚠ Metrics-server may fail to report metrics if kubelet TLS/auth configuration does not match the cluster setup
⚠ Metrics may be delayed or missing for certain workload types depending on scrape/aggregation behavior
⚠ HPA or kubectl top will show errors/timeouts when metrics.k8s.io is unavailable or RBAC is misconfigured

Alternatives

Prometheus + adapter (e.g., prometheus-adapter) for custom/advanced HPA metrics KEDA (with supported metrics backends) for event-driven autoscaling Datadog/Elastic APM integrations that expose Kubernetes metrics APIs (where applicable)

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-04-04.