Module prometheus_client 

Prometheus client for historical metrics. Prometheus Client for historical Kubernetes metrics.

Fetches historical CPU/memory usage data from Prometheus to calculate percentile values (P50, P95, P99, max) for accurate right-sizing.

Prerequisites

• Prometheus accessible (via port-forward, ingress, or direct URL)
• Prometheus collecting Kubernetes metrics (typically via kube-state-metrics and cAdvisor)

Authentication

Authentication is optional and typically not needed when using kubectl port-forward because the connection goes directly to the pod, bypassing ingress/auth layers. Auth is only needed for externally exposed Prometheus instances.

Example

use syncable_cli::analyzer::k8s_optimize::prometheus_client::{PrometheusClient, PrometheusAuth};

// Default: No authentication (works with port-forward)
let client = PrometheusClient::new("http://localhost:9090")?;

// With authentication (for external Prometheus)
let client = PrometheusClient::with_auth(
    "https://prometheus.example.com",
    PrometheusAuth::Bearer("token123".to_string())
)?;

let history = client.get_container_history("default", "api-gateway", "main", "7d").await?;
println!("CPU P99: {}m", history.cpu_p99);

Structs

ContainerHistory

Historical resource usage data for a container.

HistoricalRecommendation

Right-sizing recommendation based on historical data.

PrometheusClient

Prometheus client for querying historical metrics.

WorkloadHistory

Aggregated history for a workload (Deployment/StatefulSet/etc).

Enums

PrometheusAuth

Authentication method for Prometheus (optional).

PrometheusError

Error type for Prometheus client operations.