What is the Role of a Sidecar pattern in microservices?

The Sidecar pattern is an architectural pattern where a helper service (the "sidecar") runs

alongside a primary service (microservice). The sidecar provides auxiliary functionalities like

monitoring, logging, configuration, and service discovery without changing the core business

logic of the primary service.

Role of Sidecar:

• Decoupling: It decouples auxiliary functions (e.g., monitoring, security) from the

primary microservice, ensuring that microservices focus on business logic.

• Reusability: Sidecars can be reused across multiple services (e.g., a logging sidecar

can be attached to every service).

• Observability: Sidecars handle traffic-related concerns like load balancing, tracing,

and logging, often integrated with service meshes.

Example: Envoy is commonly used as a sidecar proxy for microservices to handle service

discovery, monitoring, and routing.