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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

GitOps
A practice where Git repositories serve as the single source of truth for both application code and infrastructure configuration.
SRE (Site Reliability Engineering)
An engineering discipline that applies software engineering principles to infrastructure and operations to create reliable systems.
GitFlow
A branching model for Git that defines a strict workflow with feature, develop, release, hotfix, and main branches.
API Gateway
A server that acts as the single entry point for API requests, handling routing, authentication, rate limiting, and monitoring.
Kubernetes ConfigMap
A Kubernetes object that stores non-sensitive configuration data as key-value pairs, injected into pods as environment variables or files.
Container Orchestration
The automated management of containerized applications including deployment, scaling, networking, and health monitoring across clusters.
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