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Prometheus

Introduction

Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. It is designed for reliability and scalability, making it a popular choice for monitoring cloud-native applications.

Basic Syntax

# Example of a basic Prometheus configuration
global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
      - targets: ['localhost:9090']

Common Use Cases

  • Monitoring system performance
  • Collecting and querying metrics
  • Setting up alerts for critical metrics
  • Visualizing metrics with Grafana

Advanced Features

  • Service Discovery: Automatically discover targets to scrape.
  • Alertmanager: Handle alerts sent by client applications.
  • PromQL: Powerful query language for querying time series data.
  • Exporters: Collect metrics from third-party systems.

Code Snippets

Service Discovery

# Example of a Prometheus configuration with service discovery
scrape_configs:
  - job_name: 'kubernetes-apiservers'
    kubernetes_sd_configs:
      - role: endpoints
    relabel_configs:
      - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
        action: keep
        regex: default;kubernetes;https

Alertmanager Configuration

# Example of an Alertmanager configuration
global:
  resolve_timeout: 5m

route:
  group_by: ['alertname']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 12h
  receiver: 'email'

receivers:
  - name: 'email'
    email_configs:
      - to: 'your-email@example.com'
        from: 'alertmanager@example.com'
        smarthost: 'smtp.example.com:587'
        auth_username: 'alertmanager'
        auth_password: 'password'

PromQL Query

# Example of a PromQL query to get CPU usage
rate(node_cpu_seconds_total{mode="idle"}[5m])

Tips & Best Practices

  • Use Labels: Use labels to add metadata to your metrics for better querying.
  • Alerting: Set up alerts to monitor critical metrics and notify the right people.
  • Service Discovery: Use service discovery to automatically discover targets.
  • Dashboards: Use Grafana to create dashboards for visualizing metrics.
  • Exporters: Use exporters to collect metrics from third-party systems.

External Resources