Sidecar

Intent

Run a helper process alongside a service instance to provide cross-cutting functionality (proxy, agent, config, telemetry).

Use when

• You want to offload concerns from the app process without requiring app-language integrations.
• You need per-instance helpers (proxies, log/metric agents) managed with the service lifecycle.

Avoid / watch-outs

• Sidecars add moving parts; define ownership, upgrades, and observability for the sidecar itself.
• Ensure app/sidecar lifecycle coordination is robust (startup order, readiness semantics).

Skill mapping

• platform: standardize sidecar configs and lifecycle wiring.
• observability: telemetry for sidecar health and its impact on app behavior.
• resilience: clarify failure behavior when the sidecar is unhealthy.