microservices.io by Chris Richardson offers a pattern language for microservice architectures: a structured set of patterns that answer how to decompose, communicate, deploy, and operate services. This post summarizes that language by category and links to the source so you can go deeper on each pattern.

Source: microservices.io — A pattern language for microservices. Pattern language by Chris Richardson.

Architectural style

Pattern	Summary
Monolithic architecture	Link - Single deployable unit.
Microservice architecture	Link - Independently deployable, loosely coupled services.

Service boundaries

Pattern	Summary
Decompose by business capability	Link
Decompose by subdomain	Link
Self-contained service	Link
Service per team	Link

Refactoring

Pattern	Summary
Strangler application	Link
Anti-corruption layer	Link

Service collaboration

Pattern	Summary
Database per service	Link
Shared database	Link
Saga	Link
Command-side replica	Link
API composition	Link
CQRS	Link
Domain event	Link
Event sourcing	Link

Transactional messaging

Pattern	Summary
Transactional outbox	Link
Transaction log tailing	Link
Polling publisher	Link

Testing

Pattern	Summary
Consumer-driven contract test	Link
Consumer-side contract test	Link
Service component test	Link

Deployment

Pattern	Summary
Multiple/Service instance per host, VM, container	Link
Serverless deployment	Link
Service deployment platform	Link

Cross-cutting concerns

Pattern	Summary
Microservice chassis	Link
Externalized configuration	Link
Service template	Link

Communication

Pattern	Summary
RPI	Link
Messaging	Link
Domain-specific protocol	Link
Idempotent consumer	Link

External API

Pattern	Summary
API gateway / BFF	Link

Service discovery

Pattern	Summary
Service registry, Client/Server-side discovery, Self/3rd party registration	Link

Reliability

Pattern	Summary
Circuit breaker	Link

Security

Pattern	Summary
Access token	Link

Observability

Log aggregation, Application metrics, Audit logging, Distributed tracing, Exception tracking, Health check API, Log deployments. See microservices.io observability.

UI design

Pattern	Summary
Server-side / Client-side UI composition	Link

Summary

See microservices.io patterns index and the PDF summary. Book: Microservices Patterns by Chris Richardson.