/learn-prometheus

Prometheus architecture

prometheus-architecture

Prometheus server

  • Retrieval - Pulls metrics data from target services like applications, servers and services ...etc
  • Storage - Stores scraped metrics in a Time series DB
  • HTTP server - web server displays data in an UI (prometheus web ui) which accepts PromQL query language

Levels of Monitoring

  • Infrastructure level - CPU, RAM, Network ... etc
  • Platform level - Kubernetes components, Docker, Bare server
  • Application level - 3rd party application and Our own applications

What does it monitor ?

  • CPU status
  • Memory/Disk usage
  • API requests count
  • Exception count

Type of metrics

  • Counter - How many times this event happened ? (ex: no. of exception, total no. of request a service as received)
  • Gauge - What is the current value of this event now ? Values can go up and down (ex: current usage of RAM or DISK)
  • Histogram - It is used to track how long an event took ? (eg: how long an API request took to complete)

Deploying types

  • Manually configuring all the yml files (Not recommended)
  • Using an operator for more info refer k8s operator
  • Using an helm chart to deploy operator (Highly recommended approach)
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update
helm install prometheus prometheus-community/kube-prometheus-stack