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DevOps Intermediate

What is Prometheus?

An open-source monitoring and alerting toolkit that collects time-series metrics using a pull-based model.

Prometheus scrapes metrics from instrumented targets at configured intervals. It stores data in a time-series database and provides PromQL (Prometheus Query Language) for powerful querying. Alertmanager handles alert routing and notification.

Key concepts include metrics types (counter, gauge, histogram, summary), labels for dimensional data, service discovery, and recording rules. Prometheus + Grafana is the de facto standard for Kubernetes monitoring.

Related Terms

Continuous Deployment
A practice where every code change that passes automated tests is automatically deployed to production.
YAML
A human-readable data serialization language commonly used for configuration files in DevOps tools and applications.
Infrastructure as Code (IaC)
The practice of managing infrastructure through machine-readable configuration files rather than manual processes.
Docker Compose
A tool for defining and running multi-container Docker applications using a YAML configuration file.
Immutable Infrastructure
An approach where servers are never modified after deployment — changes require building and deploying entirely new server instances.
API Gateway
A server that acts as the single entry point for API requests, handling routing, authentication, rate limiting, and monitoring.
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